K-Fed Takes the Kids to Vegas!

While Britney Spears remained in rehab, Kevin Federline headed to Las Vegas over the weekend – with the kids. Federline was in town for a long-planned paid appearance at the Mirage Hotel & Casino lounge Revolution. "Kevin was really low key," one source says. "You could definitely tell he was on his best behavior. He was having a good time, but wasn't the wild, crazy Kevin who used to come to Vegas."

He arrived on Saturday with Sean Preston, 18 months, and Jayden James, 6 months, plus a nanny, his mother and brother and two bodyguards, sources say. He had dinner with friends and family at the hotel's Japonais restaurant, says a source, who adds: "He was late for dinner because he wanted to tuck his kids into bed." By midnight, he was relaxing at a VIP table at the Revolution with a group of friends who included Las Vegas comedian Jeff Beacher. Spears's rehab ordeal, says a source, has matured Federline. "He wakes up with a purpose each morning and has enjoyed his family being around him," says the source. A rep for Federline declined to comment.

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