Eric Trump and his wife Lara are expecting their first child together.

The couple revealed on Monday morning that Lara, 33, is already in her second trimester and that she is pregnant with a baby boy.

Speaking to DailyMail.com from Aspen, the couple said: 'It has been an amazing year for the Trump family and we couldn't be more excited about this next big step in our life.

Surprise! Eric Trump and his wife Lara are expecting their first child together

Joyous news: Speaking to DailyMail.com from Aspen, the couple said: 'It has been an amazing year for the Trump family and we couldn't be more excited about this next big step in our life'

Proud grandfather: President Donald Trump congratulated Eric and Lara on Twitter. This will be his ninth grandchild

Celebration: Lara responded to her father-in-law's tweet by writing: 'Thank you grandpa!'

'We are thrilled to bring a baby boy into the world this September.'

However, the expectant parents admitted that their secret was by no means an easy one to keep — particularly after they shared the happy news with Eric's father, President Donald Trump.

'Eric’s dad was so excited that we were worried he’d blurt it out at a press conference,' Lara told People of her father-in-law's reaction to the news.

Eric said they found out that Lara was pregnant on his 33rd birthday on January 6, which was 'pretty cool'.

Their impending arrival will be President Trump's ninth grandchild, but the couple said that they are still having trouble coming up with a name because they have already used one of their favorite monikers.

Baby makes three: Lara, who is due in September, is pregnant with a baby boy

Hard to keep: Lara admitted that she was nervous that her father-in-law, President Trump, would spill the beans during a press conference

The secret is out! Lara took to Instagram on Monday to share her excitement over their impending arrival

Smooches: Eric announced the news on Twitter on Monday, sharing a photo of him and Lara on their two-year wedding anniversary last November

'You'll both be incredible parents': Eric's sister Ivanka tweeted that she and her husband Jared Kushner can't wait to meet their new nephew

'We really loved the name Charlie, but we’d already named our dog that, so it’s out, Eric said, and Lara added: 'We sort of screwed ourselves over there.'

Lara, who is due in September, admitted she was surprised by how 'exhausted' she was in the beginning of her pregnancy because she is a 'very active person'.

However, the former Inside Edition producer said she is feeling 'really good now', and she couldn't resist gushing about what an 'amazing dad' Eric is going to be.

Of course, Eric has had plenty of parenting practice thanks to his older brother and sister.

Donald Trump Jr. has five children with his wife Vanessa, while Ivanka Trump has three children with her husband Jared Kushner.

All smiles: Lara wore a form-fitting blue dress while walking around Los Angeles last month

Keeping secrets: Lara shared this photo in celebration of Eric's 33rd birthday on January 6 — the same day he found out that she is pregnant

Whoops! Eric revealed that they wanted to name their baby boy Charlie, but they had already given one of their dogs the beloved moniker

Lara said his nieces and nephews love spending time with him, noting that he is the 'cool uncle'.

Lara took to Instagram on Monday morning to celebrate the news by sharing a photo of her and Eric posed outside in the snow with their two dogs.

'Eric and I are excited to add a boy to our pack in September! #BabyTrump,' she captioned the image.

Meanwhile, Eric shared a photo of himself kissing his wife on the cheek on their two-year anniversary last November.

'@LaraLeaTrump & I are excited to announce that we are adding a boy to #TeamTrump in September. It's been an amazing year. We are blessed!'

On Monday afternoon President Trump praised the couple on Twitter, writing: 'Congratulations Eric & Lara. Very proud and happy for the two of you!'

All dressed up: The two are pictured together in January after Lara found out she was pregnant

Love of love: The two are pictured at the White House Correspondent's Dinner in 2016

Lara responded to the tweet, writing: 'Thank you grandpa!'

Eric's sister Ivanka also took to Twitter to celebrate the news.

'Congratulations @LaraLeaTrump & @EricTrump! We're so excited for you both. You'll be incredible parents & we can't wait to meet our nephew!' she wrote.

The couple dated for six years before they said 'I do' during a lavish ceremony at the Trump family's Mar-a-Lago estate in 2014.

The two are currently on vacation with his siblings and their children in Aspen, where Donald Jr.'s five-year-old son Tristan broke his leg skiing.

TMZ reports that father-of-five's second-youngest son fractured his leg on Sunday and that Secret Service accompanied the boy to the emergency room.

It appears that Tristan had already hurt himself by the time Ivanka treated the kids to some ice cream on Sunday afternoon.

Ivanka was seen holding her one-year-old son Theo and walking through the streets of Aspen while her nieces Chloe and Kai, nephew Spencer, and daughter Arabella tagged along and chowed down on their own cones.