Watch Jimmy Fallon awkwardly try to guess Ariana Grande's first celebrity crush
 

Watch Jimmy Fallon awkwardly try to guess Ariana Grande's first celebrity crush
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Ariana Grande was full of surprises on Thursday night's Tonight Show.

She joined Jimmy Fallon for the "Best Friends Challenge" — a game where players try to guess fun facts about each other — and we can pretty much confirm that Fallon and Grande are **t best friends. We can confirm that Fallon hates mayonnaise and that if Grande could be any animal, she'd be a seahorse (aw).

We also learned that Grande's first celebrity crush was a (probably) Grinch-era Jim Carrey — **t Jimmy Fallon. Can't win 'em all.

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