Sources have revealed exclusively to cuteperisHilton.com that Las Vegas club, Prive, hired the Good Charlotte guitarist to DJ, with a standard contractual non-compete agreement, which means he is not allowed to appear at any nightclubs the evening prior.

Instead of getting paid for the appearance, the nightclub said they would make a generous donation to the Richie Madden Children's Foundation.

His brother Joel performed a few weeks earlier and made a large sum for the children's charity.

But it seems Benji and Paris couldn't help themselves and went out the night before, violating his contract, and cancelling the agreement, which means no money for the sick kids.

When asked why he violated his agreement he said, "I feel awful but i didnt know what to do, I'm crazy about this girl," a source told Perez Hilton.

A rep for the club told PerezHilton.com exclusively, "While Prive Las Vegas is a fan of the Madden brothers and the charity, they had no other choice but to cancel his appearance as we take our agreements very seriously. Luckily we had a rockin' packed Saturday night despite Benji's absence."

But a source close to Benji and Paris told Perez Hilton: "Prive is just desperate for press. The real story is that Paris and Benji went to go spend a romantic weekend in Vegas for his birthday but Benji cancelled when he found out they wanted him to do both TV and magazine interviews on the red carpet.

"He had only agreed to do pictures. He said he would only DJ and wasn't there to do a press conference. He decided to cancel since the Prive people were so insistent and he felt used and annoyed.

"Plus, LAX, who works very closely with Paris, offered Benji a huge deal he couldn't refuse. Everyone in Vegas loves LAX and Pure. Paris planned a huge blowout at LAX and he chose his girl over some lame club. They are very happy and they had a blast," they told Perez.