Cameron Diaz and Alex Rodriguez made some very public displays of affection this weekend -- amid rumors the baseball stud was seen flirting with "Real Housewives of New York" star Kelly Bensimon.

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The couple, who is usually very private, had their hands all over each other this weekend when cameras caught them in Miami on Friday -- just days after Page Six reported A-Rod "had his arm 'round Kelly and they were flirting" at a party.

Rodriguez's rep shot down the rumor -- and, this weekend, the only one he had his arm around was Cam.

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