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Guess Who

AKM-GSI

There's some monkey business going on in Hollywood.

Monday night one movie-star mom went all out with a sock-monkey-doll Halloween costume.

Wearing the head-to-toe ensemble, this funnylady (with an equally funny and often controversial other half) was unrecognizable. Think you definitely maybe know who it is?

Isla Fisher

AKM-GSI

If you guessed Isla Fisher, you're correct!

The 36-year-old Wedding Crashers star attended a Halloween party in Beverly Hills with hubby Sacha Baron Cohen. The DIctator himself also got into the holiday spirit, pairing a gorilla mask with a cow bodysuit.

Their daughters Olive, 5, and Elula, 2, sure are lucky to have such fun, festive parents.