A video of the First Family during Trump's first inauguration has been shared thousands of times and everyone is asking the same thing - why did her smile turn to a frown?

It’s one of the most important jobs never applied for. Unelected, yet inextricable from politics; constantly visible on the world stage, but rarely the one behind the microphone — for all its glamour, the first lady of the United States is a role of unsolicited duty, often bringing with it intense public scrutiny, including over what they wear.

President-elect Donald Trump started his official return to Washington Saturday afternoon to prepare for his historic inauguration. The Republican, along with wife Melania and youngest son Barron, waved to a crowd of supporters as he boarded his private Trump Force One aircraft in West Palm Beach, Florida.

"How tall is Barron Trump?" is a viral topic. Google listed Donald and Melania's son as 6-foot-9 two months after news reports said he was 6-foot-7.

Melania Trump made a subtle dig toward the Obamas, claiming they “withheld” information from her husband during his first term in the White House that ultimately made the transition

Happy anniversary! In 2005, model Melania Knauss married billionaire, future president Donald Trump in Palm Beach, Florida, with Mar-a-Lago reception

Melania Trump has been welcoming to Elon Musk as he spends significant time at Mar-a-Lago with her husband, Donald Trump, multiple sources tell PEOPLE

(L-R): Melania Knauss, Donald Trump, Trump’s son, Eric, and the latter’s girlfriend (and future wife) Lara, as they pose together during a New Year’s Eve party at the Mar-a-Lago estate, Palm Beach, Fla., Dec. 31, 2002.

President-elect Donald Trump's wife Melania Trump shared whether she'll live in the White House, the Trump Tower in New York or Mar-a-Lago in Florida after her husband is sworn into office on Jan. 20.

Ivanka Trump and Jared Kushner call Billionaire Bunker home. She's daughter of Donald and Ivana Trump with siblings Don Jr., Eric, Tiffany and Barron

Ahead of Inauguration Day on Monday, President-elect Donald Trump is holding a reception and fireworks show Saturday night at his golf club in Virginia. On Sunday, he will lay a wreath at Arlington National Cemetery and then hold a "Make America Great Again Victory Rally" in Washington ahead of Monday's swearing-in ceremony,