Meet the latest and greatest TikTok sensations: Jennifer Lopez and Jimmy Fallon! In an exclusive sneak peek from tonight's The Tonight Show Starring Jimmy Fallon, the duo go head-to-head on their virtual dance floors.
Calling it the "Watch-it-Once TikTok Challenge," Jimmy says, "Jennifer and I are going to watch a TikTok challenge that neither one of us have ever seen before.
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