An argument over a little starlet is turning into a big fight.

Joel Madden, reported baby daddy to Nicole Richie's unborn child, and "The Hills" star Spencer Pratt are having an argument about "The Simple Life" star.

According to reports, Joel was not impressed that Spencer has publicly said negative things about Nicole. The reality TV personality is apparently the 'brains' behind Brody Jenner achieving his dream to become the man who got Nicole to eat.

During a relaxing day at The Beverly Hills hotel, where soon-to-be parents Joel and Nicole were dining, the Good Charlotte front man approached Spencer and said, "you've been talking s**t about my girl!"

Feisty Spencer didn't take the accusation lying down and the pair quickly got physical. Reports claim that Joel and Nicole were asked to leave the premises.

Spencer, who is 'engaged' to his co-star Heidi Montag, has explained the situation to In Touch Weekly magazine.

He said, "It all stems from an interview in Details ages ago where I was misquoted, calling Nicole a skinny bitch. It's all a misunderstanding. I've always thought she's a really nice girl and I wouldn't call her that."

Spencer and Nicole were connected during her days dating his best friend, Brody.

The super skinny starlet is reportedly 12 weeks pregnant.

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