People think she's a Russian spy.
As "evidence," internet commenters point to a chat she had with Russian President Vladimir Putin at a dinner for last year's G-20 Summit.
While Trump doesn't speak Russian, she does know English, French, German, Italian, and Serbian, in addition to her native Slovenian — more languages than any previous American first lady.
Many saw her engaged in conversation at dinner with Putin, and reports described the two as friendly during the meal.
But there is no proof that Trump and Putin have had any other interaction, and no reason to think she has performed any work as a Russian spy beyond the occasional satire piece.
She has worked as a model and is a self-described "full-time mom", but hasn't mentioned Russian intelligence as a specialty.
People think she doesn't live in the White House.
There's a "persistent" rumor that Trump lives in a separate house in DC with her parents and son, Barron Trump.
In a Washington Post story about the first lady's private life, her office refuted the rumor as "1,000% false." Trump's spokeswoman Stephanie Grisham added, "We laugh at it all the time."
White House social secretary Rickie Niceta Lloyd called the rumor "an urban legend," and press secretary Sarah Huckabee Sanders said it was "ridiculous."
"Just when you think the Washington Post can't get things any more wrong, they do," Sanders said. "The first lady lives here at the White House. We see her here regularly."
Trump took longer than usual to move to the White House after her husband took office, spending the first five months of his presidency in New York City while Barron finished school in Manhattan.
In June 2017, the mother and son finally moved to the White House, and Barron started attending St. Andrew's Episcopal School in Potomac, Maryland, in the fall.
People think she has a body double.
The theory first sprang to life when some thought Trump had been replaced by a look-alike for a public appearance, and continued when she was pictured alongside a Secret Service agent with similar hair and complexion.
This rumor has been vehemently denied by her spokeswoman Stephanie Grisham, but that didn't stop the internet from going ablaze.
Business Insider's Kate Taylor dug into the mystery, and noticed the secret service agent was always wearing heels in photos of her with the first lady.
The photos of the agent have Trump in them, which would make it pretty hard for her to be a "body double" for the first lady.
People think she spends little to no time with her husband.
While this is more of a well-cited description, the first lady's marriage is never far from the realm of speculation.
Trump's life inside the White House reportedly includes very little time in the West Wing with her husband, a claim her staff attributes to the couple's independently busy schedules.
Spokeswoman Grisham said Trump is primarily focused on being a mom, a wife, and the first lady. "The rest is just noise," she added.
