Cameron Diaz Heads to Kelly Slater's Birthday Bash

They may not be dating but that doesn't meant that Cameron couldn't help celebrate her good friend's 35th birthday party last night.

Slater ended rumors of the two being romantically involved by bringing a new, Brazillian model girlfriend out this past weekend to a golf and fashion party.

Says a source, "They were definitely a couple at the event. Kelly wouldn't identify his new girl, but we all knew she was extremely special to him. Cameron quickly became a thing of the past."