They say first impressions are everything. But what about your best celeb impressions? For Jimmy Fallon, he can’t let his ol’ pal Tina Fey slip past him without demanding she do her god-awful Robert Deniro impersonation. Last night (Dec 15), he had her on the Tonight Show, and she was forced to imitate A-list celebs.

Continue below…

Tina Fey and Amy Poehler’s Opening Golden Globes Monologue