Clown-faced Cameron Diaz ignored the cardinal rule of breakups – act like you’re having a good time and ignore the bastard. She was said to have followed Justin Timberlake to two different Golden Globes after-parties, and to have had an awkward talk with him. She even got all up in gorgeous Jessica Biel’s face after she saw Biel talking to Timberlake. That doesn’t seem like a smart move considering that Biel could probably kick her ass. Diaz has crazy going for her, though, and sometimes that trumps brawn.

CAMERON Diaz is not over Justin Timberlake just yet, and things got heated when she saw her ex chatting up Jessica Biel in L.A. after the Golden Globes. Sources say the temperamental star “blew up” at Biel after she saw Timberlake flirting with her. Diaz followed Timberlake to the In Style party at the Hilton Oasis, where “they had an awkward conversation.” The “Charlie’s Angels” star then trailed Timberlake to the Beverly Hilton rooftop for the Universal party, where she found him chatting up Biel – and screamed at the “Illusionist” star. “If that’s how she wants to get him back, it won’t work,” said our insider. “She’s desperate.” Reps for Diaz did not return our call.

It’s just common sense not to act all crazy around your ex. Do not contact him. That means no drunk dialing! If you want to get him back, and are willing to go through all the crap you dealt with for him but are conveniently ignoring due to fresh heartache, then you have to feel good about yourself. Go hang out with your friends, get a new hairdo, exercise, and spoil yourself. Once you feel good again you’ll realize you’re better off without him anyway.

Update Here are pictures of Diaz at LAX yesterday showing her fab fashion sense. Thanks to Celebrity Puke.