Jennifer Lopez Almost Throws Her Neck Out In Dance Battle With Jimmy Fallon (Video)
Pop Stars -- Then & Now

Why on earth would anyone challenge Jennifer Lopez to a dance-off?

Jimmy Fallon must have been feeling brave on Wednesday's "The Tonight Show" Wednesday when he battled J.Lo in a game where the two made up new dance moves on the spot after picking a name out of a velvet grab bag.

The improvised moves included "Putting on Skinny Jeans," "Washing Machine on Spin Cycle," "The Walking on a Moving Bus" and the "Hot Cowboy."

See More: Mike Myers Makes Rare TV Appearance for Dance Battle with Fallon

Lopez wowed the crowd with her hip thrusts and hair flips for the washing machine dance, commenting that she "almost threw my neck out" trying to one-up Fallon.

Watch the competition above and see the duo end the competition with a "dance duet" for "Seeing Yourself on a Jumbotron."

Sorry Jimmy, but Jenny from the Block's got you beat:

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