Cameron Diaz was seen "grinding" on Alex 'A-Rod' Rodriguez at a party on

The 'My Sister's Keeper' actress and the baseball player were at the CAA Party in Miami and began flirting with each other.

The New York Yankees player was sitting on a couch beside Cameron as she "was dancing by herself" before moving her gyrating body towards him.

At one point the blonde beauty - who was "tipsy" and being very "fun and flirty" - began "grinding on 'A-Rod'".

The 37-year-old actress also partied with friends Tom Cruise and Katie Holmes at the bash, and was seen in between the two chatting when she wasn't hanging out with the hunky sportsman.

Katie and Cameron were getting along great. They were having a great time.
 A fellow reveller told America's OK! magazine: "Katie and Cameron were getting along great. They were having a great time."

Other stars at the party included Jessica Alba, Adrian Grenier and Kevin Connolly.

Alex, 34, has been single since splitting from actress Kate Hudson in December.

Cameron has previously dated a host of famous men including Maroon 5 star Adam Levine, musician John Mayer and British model Paul Sculfor.