Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama supporters urge Biden to pick former first lady as running mate Michelle Obama wishes Barack a happy birthday: 'My favorite guy' Obamas discuss pandemic, voting, anxiety and community in new podcast 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.

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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.