It's not so much Nicki's reaction, more the entire lack thereof. It's totally the Mona Lisa of moments... take from it what you will. We're taking that she's just not really into it. 

Does a gif on repeat give more away?

How about this one?

How about an extreme close up?

http://bassgiutarist.tumblr.com/post/133762432623/nickis-face-when-jlo-was-dancing-to-anaconda

Or perhaps we should've kicked things off with Lily Singh's tweet

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