Hollywood. It's a jungle out there.

Yesterday, Leo DiCaprio went on a street safari down Hollywood Blvd. searching for the perfect Halloween costume with his buddies. After ducking in and out of stores, the group settled on the primate look, scooping up a few gorilla outfits.

"The Departed" actor couldn't wait to check out his new mask as they left the costume store, but his friend beat him to the punch by rocking the whole gorilla ensemble right on street.

While Leo always likes to dive deep into his roles, we're hoping he stays away from poo flinging.