L.A. Dodgers pitcher Brian Wilson snapped over the weekend ... into a Slim Jim ... 'cause he dressed up as the Macho Man Randy Savage for a humongous celebrity-filled Halloween party in Bev Hills.
The place was packed with famous people -- like Larry David (who dressed up with another guy as Siamese twins), Hilary Duff & her NHL husband Mike Comrie, David Spade, Cindy Crawford and more.
Wilson eventually left the party with a super hot mystery chick.
After all, he's a closer.
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