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Watch Justin Bieber, Chris Brown And More In A Christmas Day Dance-Off

It was time for the #ChristmasChallenge.

Christmas Day: Family, trees, gifts -- and dance-offs?

If you were Justin Bieber, Chris Brown or plenty of others on Thursday, then, yes, that was part of your 2014 Christmas celebration, too.

Things started on Christmas Eve, actually, when choreographer Woody McClain kicked off the challenge. "Who want this battle??? NOBODY?? Oh I thought so!! W/ @splack_19 @edwinjbennett (Tag A friend who want it) #RightThurr #Woody_TheGreat," he posted on Instagram, along with a video of himself and two others dancing to Chingy's 2003 single "Right Thurr."

Breezy not only accepted (while wearing a robe, in front of a Christmas tree), but also helped the challenge get a viral boost, re-posting videos from fans and fellow celebs throughout the day.

Biebs had some fun with the whole thing, too.

CB also came back for round two -- this time linking up with the three from the original video, including McClain.

La La got involved.

Lil Mama came with it, too.

Boxer Adrien Broner showed off his moves outside the ring.

Plus some kids had at it.

Dudes broke it down on the street.

And, of course, elves.