DONALD Trump has formally "signed in" as US President after vowing to give “power to the people”, “put only America first” and “eradicate Islamic terrorism from the face of the earth”.

His cheeky grand-daughter, Arabella Kushner, stole the show when she took some of Trump's pens just as the new President was trying to sign on the dotted line.

Arabella's mum, Ivanka, did not appear to spot her daughter playing with the pens while Trump was signing papers to formally nominate his cabinet.

For the latest updates on Trump's inauguration, follow SunOnline's live blog here.

69 Donald Trump has formally "signed in" as US President - but his grand-daughter Arabella Kushner (in red) stole the show

69 Arabella Kushner tried to take one of Trump's pens just as the new President was trying to sign documents Credit: Sky News

69 Trump was surrounded by his family and his Vice President Mike Pence

69 At one point, Arabella lay her head down on the table, but her mum Ivanka seemed pre-occupied Credit: Sky News

69 Trump seemed to find it funny and laughed along with his family, pictured is his wife Melania in blue and their son Barron, 10, covering his face

69 Melania was pictured kissing Trump on the cheek during the signing of the documents Credit: Sky News

It came minutes after he stood in front of a crowd of 900,000 Americans on Capitol Hill vowing to unite a divided country in his inaugural address.

In an attempt to heal the rifts his election has crystallised, Trump said: "When America is united, America is totally unstoppable."

He added later: "Whether we are black or brown or white, we all bleed the same red blood of patriots.

"A new national pride will stir our souls, lift our sights, and heal our divisions."

Continuing the theme of uniting the country under the American flag, his was a patriotic clarion call.

69 Donald Trump was sworn in as President with Melania by his side Credit: AP:Associated Press

69 He made an emotive inaugural address on the steps of Capitol Hill Credit: Getty Images

69 He declared war on terrorism in his speech Credit: Reuters

69 The new President vowed to heal divisions in the country Credit: Getty Images

"From this day forward it's going to be only America first...we must think big and dream even bigger. A nation is only living as long as it is striving," he said.

With the eyes of the world on him, as well as famous faces and former presidents in the packed crowd, Trump used his inaugural speech to blast the establishment.

He said: “Today will be remembered as the day the people became the rulers of this nation again.

"We are transferring power from Washington and giving it back to you, the people.

TOP TRUMPS: The best moments from Donald's speech "You will never be ignored again." "We will follow two simple rules: Buy American and hire American." "From this day forward it's going to be only America first." "We must think big and dream even bigger. A nation is only living as long as it is striving." “When America is united, America is totally unstoppable." "Together, we will make America great again." "January 20th, 2017 will be remembered as the day the people became the rulers of this nation again." "The time for talk is over, now begins the hour of action." “We will make America safe again. We will make America great again." "Whether we are black or brown or white, we all bleed the same red blood of patriots." "A new national pride will stir our souls, lift our sights, and heal our divisions." "This moment is your moment. It belongs to you..." "When your heart is filled with patriotism, there is no room for prejudice." "I will fight for you with every breath in my body and I will never, ever let you down." "Don't allow anyone to tell you it cannot be done." "We must think big and dream even bigger."

69 Trump has been officially sworn in as President

69 Trump has officially been sworn in as President after taking the Oath of Office

69 Trump was surrounded by his family, including his 10-year-old son Barron

69 Melania was seen fixing Barron's tie during the ceremony Credit: Reuters

69 The 10-year-old did not seem to be impressed by his mum's fussing Credit: Getty Images

69 Barron was spotted yawning as he sat under his mums umbrella Credit: Getty Images

69 Trump’s children (r-l) Tiffany, Eric, Ivanka and Barron are pictured here with Melania (left) during the Oath of Office Credit: Getty Images

69 Obama waved at the crowds when he left the ceremony in a helicopter Credit: Getty Images

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"The time for talk is over, now begins the hour of action. The forgotten men and women will be forgotten no longer.”

Speaking directly to the Americans who voted for him, hoping that he can lift their economic fortunes, he had this to say: "This moment is your moment. It belongs to you..."

He took the chance to tear into the establishment while cops fired teargas and fought running battles with activists three miles away.

Trump promised his every decision in office would be guided by two rules – “Buy American and hire American”.

"From this day forward, a new vision will govern our land. From this day forward, it's going to be only America first," he said.

69 Donald Trump gave a thumbs up as he arrived at the podium

69 Future Vice-President Mike Pence was seen clapping as Trump waved to the crowds

69 A crowd of 900,000 gathered in Washington to watch the ceremony Credit: Reuters

69 Trump waved to the crowd with Melania by his side

"Together we will make America strong again. We will make America wealthy again. We will make America proud again.

"We will make America safe again. And, yes, together, we will make America great again."

He placed the battle against Islamic extremism at the heart of his foreign policy as he took office, vowing to work with allies to destroy the jihadist threat.

"We will reinforce old alliances and form new ones and unite the civilised world against radical Islamic terrorism, which we will eradicate completely from the face of the earth," he declared.

It has been suggested he promise to form new alliances against terror may mean he intends to work with Vladimir Putin's Russia.

Trump's emotive speech came after he took the Oath of Office in front of a crowd of distinguished guests and supporters.

Jimmy Carter, George W Bush, Laura Bush and Hillary and Bill Clinton were just some of the well-known faces spotted in the crowd.

69 Trump gave the camera a stern look before walking out to greet the crowds

69 Trump arrived at Capitol Hill to chants of "USA! USA! USA!" as he prepares to be sworn in as US President

69 Donald Trump was seen arriving at Capitol Hill with President Obama

69 All of Trump’s children were seen following a few metres behind their father

69 Ivanka Trump was pictured with her siblings Tiffany and Barron

He paid homage to his Scottish mother, Mary Anne Macleod, by taking his presidential oath with a Bible she gave him.

After Trump's speech, Jackie Evancho, 16, who rose to fame on the TV show America’s Got Talent, sang the national anthem.

Trump and Melania then attended the official lunch - where the new President made an effort to thank Hillary for coming.

Trump spent his morning attending church and meeting the Obamas for breakfast at the White House as he prepared to take office.

He headed to the US Capitol in his presidential limo with Obama before they made their entrance together.

All of Trump's children followed within metres of their father so they could watch him take his oath at noon local time (5pm GMT).

Earlier in the day, Barack and Michelle Obama were pictured waiting on the steps of the White House before Trump and his wife arrived to cheers.

Trump, 70, and Obama were pictured shaking hands and asking each other how they were doing.

69 Donald Trump and President Obama were seen leaving the White House before heading to Capitol Hill in a limo Credit: Sky News

69 Obama and Trump seemed deep in conversation as they left the White House Credit: Sky News

69 Donald Trump and his wife Melania were welcomed to their new home – the White House – by the Obamas today ahead of the inauguration ceremony Credit: AP:Associated Press

69 Trump saluted the soldier on the door as he made his way inside the White House Credit: Getty Images

69 Trump was spotted flashing a thumbs up Credit: Getty Images

69 Trump and Obama were pictured shaking hands on the steps and asking each other how they were doing Credit: Getty Images

69 The current and future First Families posed together on the steps of the White House

69 Donald Trump was seen kissing Michelle Obama on the cheek Credit: Sky News

69 Melania and Michelle shook hands on the steps Credit: AP:Associated Press

69 Melania was seen carrying a blue box from Tiffany’s Credit: Getty Images

69 Melania and Michelle embraced on the steps of the White House

Melania gave Michelle a warm hug before handing over a gift box from Tiffany's.

All four then waved to the crowds before heading inside to enjoy a cup of coffee.

Trump started his big day by tweeting "the work begins" as hundreds of thousands of people poured into Washington DC to welcome - or oppose - his inauguration.

He then headed to St John’s church in Washington for the traditional morning prayer service.

Trump was met by cheers from supporters who had braved the rain to greet the future president as he walked hand-in-hand with Melania to the church.

69 Ex-president George W. Bush and his wife Laura flash a smile and a wave as they arrive in DC Credit: Getty Images

69 Hillary Clinton arrives at the US Capitol ahead of the ceremony Credit: Getty Images

69 Wearing a cream suit, Hillary greeted the crowds Credit: Getty Images

69 Former President Bill Clinton accompanied his wife Credit: EPA

69 Donald Trump has been pictured for the first time on Inauguration Day just hours before he is officially sworn in as President Credit: AP:Associated Press

69 Trump was seen arm-in-arm with Melania Credit: AP:Associated Press

69 He was met by cheers as he climbed out of his blacked-out car

69 The President-elect was spotted arriving at St John’s church in Washington hand-in-hand with his wife Melania

69 Trump was seen wearing a dark coat, smart shirt and red tie

69 Trump looked a little nervous as he arrived at the church Credit: AP:Associated Press

69 Trump and Melania were greeted by the pastor at the door Credit: AP:Associated Press

Trump waved to the crowd as he walked into church with Melania - who was wearing a powder blue dress with matching gloves and heels.

Her stylish ensemble drew comparisons to JFK’s glamorous wife and 60s style icon Jackie Kennedy.

The future First Couple then shook hands with the pastor.

They arrived minutes after Trump's daughter Ivanka and a number of the President-elect's Cabinet picks - including Mike Pence and Defense Secretary James Mattis.

All of Trump's children were in attendance with him Friday morning, except his youngest son Barron, age 10.

69 President Barack Obama flashed a smile as he left the Oval Office for the final time Credit: Getty Images

69 Obama waved to the photographers

69 Vice-President Mike Pence arrived minutes before Trump

69 Dr Ben Carson was also seen arriving for the ceremony Credit: AP:Associated Press

While they sat through the church service, Obama was seen leaving the Oval Office for the last time.

He is understood to have left a letter for his successor.

Just hours before handing over the leadership after eight years, Obama encouraged the public to share ideas for what his new presidential centre in Chicago should do.

"I won't stop; I'll be right there with you as a citizen, inspired by your voices of truth and justice, good humor, and love," Obama tweeted

"As we look forward, I want our first steps to reflect what matters most to you. Share your thoughts."

The eyes of the world will be on Trump as he takes the Oath of Office and offers his inaugural address at around noon local time (5pm GMT).

69 The sun rises behind the Capitol in Washington Credit: AP:Associated Press

69 Trump and his wife Melania take part in a Make America Great Again welcome concert in Washington Credit: Getty Images

It all begins today! I will see you at 11:00 A.M. for the swearing-in. THE MOVEMENT CONTINUES - THE WORK BEGINS! — Donald J. Trump (@realDonaldTrump) January 20, 2017

The official swearing in ceremony, which dates back to the time of George Washington, took place on the steps in front of the US Capitol.

Hundreds of thousands of people filled the capital to watch Trump take office 10 weeks after stunning America and the world by winning the US election.

While many were there to celebrate, protesters came out in force to disrupt the day.

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Protesters blocked routes into Trump's ceremony early this morning as thousands took to the streets to oppose his presidency.

Demonstrators lined up at a number of entrances at the US Capitol building, where Trump will be sworn in.

Scuffles broke out as police tried to push feminist protesters at one entry point to allow Trump supporters through.

69 Crowds started packing in to the Washington Monument from the early hours of Friday morning Credit: Getty Images

69 Supporters gather in front of the U.S. Capitol Credit: Getty Images

69 Organisers expected crowds of upwards of 900,000 people, including protesters Credit: Sky News

69 Protesters blocked routes into Trump's ceremony early this morning as thousands took to the streets to oppose his presidency Credit: EPA

69 Demonstrators lined up at a number of entrances at the US Capitol building Credit: Getty Images

69 Russian artist Vasily Slonov (left) was seen carrying this life-sized cutout of Trump Credit: Reuters

69 Hundreds of thousands of people lined the streets Credit: EPA

Many waved placards which read "p**sy witches against Trump" and "feminists against facism".

Police pepper sprayed protesters after they clashed with Trump supporters outside a We Stand United rally outside Trump Tower last night.

Trump has pledged to unite America after his shock election win and now the tough work starts – turning the rhetoric into workable and affordable policies.

69 Defense Secretary 'Mad Dog' James Mattis pictured arriving for a service at St John’s Episcopal Church in Washington Credit: AP:Associated Press

69 Treasury Secretary Steve Mnuchin and his wife Louise Linton arrive for the church service Credit: AP:Associated Press

69 Tom Price and his Elizabeth Clark arrive at church Credit: AP:Associated Press

During the ceremony, Trump took the traditional oath: “I do solemnly swear (or affirm) that I will faithfully execute the office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States.”

Trump then delivered his inauguration address, which he is understood to have written himself.

69 Donald Trump and Melania Trump at the pre-inauguration Candlelight dinner Credit: Getty Images

69 The presidential seal is seen in front of the White House before the Inauguration Day parade Credit: Reuters

Security chiefs banned drones from flying within 30 MILES of Donald Trump over fears the new President will be targeted by terrorists at his inauguration.

The Federal Aviation Administration has grounded all drones within a massive radius of this afternoon’s swearing in ceremony in central Washington.

Security planning for the high-profile event began in April and has involved federal, state and local agencies.

Along with about 28,000 security personnel, there will be dozens of trucks, dumpsters and busses parked to fortify the edge of the ceremony – which is expected to draw up to 900,000 people.

Security along a so-called hard vehicle perimeter, within which only official cars may operate, reflects a renewed focus on the threat posed by trucks after the ISIS attacks in Nice and Berlin.