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InTouch Weekly is reporting that baseball star Alex Rodriguez is ALREADY cheating on Madonna.

 

In mid-November, A-Rod allegedly met and came 'obsessed' with model Melissa Britos at the Fontainebleau Miami Beach opening party.

 

Madge's pal Gwynnie Paltrow didn't do her job of keeping an eye on him good enough at the event!

 

One of the model's friends said, "He became obsessed with her. He sent her at least a dozen text messages, asking her to spend time with him."

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 http://perezhilton.com/2008-12-04-a-rod-cheats-on-madonna

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