Michelle Obama Michelle LeVaughn Robinson ObamaBlack stars reimagine 'Friends' to get out the vote Obama shares phone number to find out how Americans are planning to vote Michelle Obama: 'Don't listen to people who will say that somehow voting is rigged' MORE made a surprise appearance Thursday at a children's hospital in Colorado, where the former first lady spoke with children alongside Santa Claus at an event and read the holiday classic "The Night Before Christmas."

One child at the event, one of several surprise appearances for Obama in recent weeks, reportedly asked her about her dancing skills, and was shown coaching her on the "orange justice" dance from the popular "Fortnite" video game.

—MICHELLE OBAMA DANCES—



Former First Lady #Michelle #Obama was asked what her favorite dance move was. She couldn’t find an exact answer. But, said she can’t floss.



Then, one @childrenscolo kid taught her, and #Santa, how to do the #Fortnite “Orange Justice” dance @CBSDenver pic.twitter.com/VVB6SJD5EK — Dillon Thomas (@DillonMThomas) December 13, 2018

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Obama championed childhood fitness and wellness during her time in the White House, and has in recent weeks made surprise appearances at a school in Chicago and Detroit's Motown Museum as part of the tour for her bestselling book.

The former first lady's memoir, "Becoming," was released in November, when it sold more than 725,000 copies on its first day in circulation.