Long live Filliam H. Muffmin...

Onscreen lovebirds Rachel Bilson and Adam Brody, who play a cute couple on The O.C. and have also dated offscreen since 2004, have decided to call it quits.

"They've been done for a few weeks," a friend close to the couple tells Life & Style. "They are just done. That's all there is to it. There's no drama. They just ended it."

That may explain why Adam showed up solo to a party on Nov. 28 for the U.S. premiere of Volkswagen's concept car Tiguan in LA.

"He was definitely acting like a single guy," an eyewitness tells Life & Style.

According to nightlife insiders in LA, he's been spending a lot of time without Rachel at the clubs with his guy friends.

Reps for the two would not comment.

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