Sasha Obama turned sixteen on Saturday, a day before Twitter was shocked to discover (again) that the former First Daughter's real first name isn't Sasha, but Natasha.

'Today is the one year anniversary of me finding out Sasha Obama's actual first name is Natasha,' wrote Refinery29 writer Ashley C. Ford on Twitter on Sunday, unleashing a firestorm of stunned tweets from people who were just hearing the news for the first time.

'Sasha Obama's real first name is Natasha??' replied an astonished Willmarie Samarez. 'We've been living a lie!'

Refinery29 writer Ashley C. Ford's tweet started the shock waves through Twitter at Sasha's legal first name, Natasha

Twitter was surprised to find out that Sasha's first name is really Natasha and reacted with exaggerated shock

Sasha, above with Michelle and Barack, celebrated her sixteeth birthday on Saturday but this party was reportedly held in May

Hundreds of people replied to Ford's tweet, professing to be 'shook' to the core. Others saw this as more evidence of a Russian conspiracy.

'What's Malia's name? CHELSEA?' snarked Ashly Perez.

'Today's going to be the anniversary, going forward, of me finding out Sasha Obama's actual first name is Natasha,' wrote Johnny Karate.

'Sasha Obama's real first name is Natasha. Malia's real first name is Boris. Wake up people, this Russia thing is bigger than you think!!!!' snarked Rich Jones.

On Saturday, the former First Daughter celebrated her Sweet 16, though her party, in which she stunned in a red slip dress, reportedly took place sometime in May.

Birthday wishes rang in from around the country, and fans expressed their admiration for the teen on social media after photographs of her party emerged online.

The teen posed alongside her friends, which include the Real Housewives of Potomac star Charrisse Jackson's daughter Skylar, according to YBF.

Photos of Sasha next to her beaming parents and maternal grandmother Marian Robinson were also liked and retweeted thousands of times on Twitter.

About as many shared the news of Sasha's 'real' name.

As out of the blue as the news may have been for many, Sasha's legal name has been in the public realm, including on Wikipedia, for years.

Michelle and Barack Obama, like many parents, gave their child one name and then saddled her with a nickname too

Jones jokingly tied in Sasha's name, popular in Russia, with the Russian scandal engulfing the current administration

At least one person acknowledged that he had already lived through this bombshell - a year ago

Sasha aka Natasha Obama caused a stir online when people found out her name wasn't quite what most people had thought all these years

But it was only last summer that Sasha went by her full name during her summer job at a seafood restaurant on Martha’s Vineyard, and the change got picked up by some media outlets, making the name more well known, reported The Huffington Post.

Some tweeters acknowledged that next year an entirely new crop of now-ignorant people would discover this 'new' news.

'Remember how a bunch of us learned Sasha Obama's full name was Natasha... LAST YEAR?' wrote Brandi Geography.