Despite having a pretty rough week, Michelle Obama found some time to smile and goof around with LeBron and the rest of the Cavs on Thursday ... pulling off a Mannequin Challenge at the White House!
The Cavs were at 1600 Penn. to be honored by Obama for winning the NBA championship -- and decided to get in on the social media craze while there.
No sign of Barack ... guessing he wasn't in the mood.
Waiting for your permission to load the comments.