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While Britney Spears remained in rehab, Kevin Federline headed to Las Vegas last weekend – with the kids.
Federline was in town for a long-planned paid appearance at the Mirage Hotel & Casino lounge Revolution, sources tell PEOPLE.
"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, six months, plus a nanny, Federline's 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' 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.