First lady Melania Trump was unaware that her personal Twitter account liked a tweet that was critical of her marriage to President Trump.

"The first lady wasn't aware of this until I brought it to her attention," spokeswoman Stephanie Grisham told the New York Post on Wednesday.

Andy Ostroy, a New York marketer and pundit, tweeted video of the first lady flashing a smile at the president during his inauguration, then scowling as he turned away.

"Seems the only #Wall @realDonaldTrump's built is the one between him and @FLOTUS," he wrote.

He took a screenshot of Trump's personal verified account liking the tweet, and questioned whether it was her real account.

Grisham didn't know if Trump's account had been hacked or if someone with access to the account had liked the tweet.

"Who knows ... it isn't her primary account these days," she added.