Some people never change, like for instance Kevin Federline. He's back to his party ways, in Las Vegas with his gambling buddies, leaving wifey at home with the babies.

Kevin was reportedly seen at one of Vegas hot spot called, Tao - knocking back drinks with friends and surrounded by beautiful women.

Kevin seems to know he is being a bad boy because he shrunk every time when fans or paparazzi tried to photograph him.

An eyewitness added: "Every time someone tried to take a picture, he freaked out."