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A-Rod has moved onto a new hot blonde with Cameron Diaz, and it seems like he's wasting no time taking his hook-up public!

A source tells OK that “A-Rod and Cameron have been totally hooking up,” and proved it with a ton of PDA at the CAA party in Miami on Saturday night.

Cameron was apparently being very “fun and flirty,” even “grinding on A-Rod” on the dance floor. Sounds a little more "slutty" than "fun and flirty," but we bet A-Rod didn't mind in either case!

I guess A-Rod's got a thing for sexual aggressive blondes. But will this relationship last longer than he and Kate (or he and Madge)?