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After a weekend of parties, Halloween finally went down Monday -- and last night's costumes definitely didn't disappoint!

Heidi Klum continued her reign as the Queen of Halloween, by appearing virtually unrecognizable in an ape costume with husband Seal. Yes, that's actually the supermodel above (center)!

Her bash at the PH-D Rooftop Lounge at Dream Downtow in NYC was a star-studded affair -- attended by Fergie (as one of the "Toddlers and Tiaras" stars), Tyson Beckford, Vinny Guadagnino (as Derek Zoolander) and models Chrissy Teigen, Jessica White and Doutzen Kroes.

Beyonce, or should we say Bee-once, stepped out in costume last night too, hiding her baby bump in a bee suit.

We're also loving Shaun White's costume, which he shared on WhoSay: Julia Roberts in "Pretty Woman!"

Other celeb sightings included The Situation, Harrison Ford and Calista Flockhart as 80s rockers, Lauren Conrad, pregnant Jennifer Garner, Melissa Gorga and many many more!

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