Kevin Federline warns Paris Hilton off Britney

Kevin Federline has warned Paris Hilton to stay away from Britney Spears.

The dancer and rapper – who has two children with ex-wife Britney – told the hotel heiress to leave the 'Gimme More' singer alone because she does not need any bad influences in her life.

Kevin reportedly told the socialite at the Las Vegas launch of restaurant and club Lavo he does not want Britney – who recently scooped three gongs at the MTV Video Music Awards – to return to her troubled lifestyle for the sake of his children Sean Preston, three, and Jayden James, two.

A source told Britain's Daily Star newspaper: "It was quite a chilling warning. She was quite friendly and asked how Britney and the kids are but she won't be asking again."

Britney has previously enjoyed some notorious nights out with Paris, 27. The pair – along with actress Lindsay Lohan – were regulars on the Los Angeles party scene in 2006, often pictured flashing photographers while wearing no underwear.

Britney, 26, threw a joint truck-themed birthday party for Sean, who turned three on September 14 and Jayden, who was two on September 12, on Saturday (13.09.08).

The boys had a great time driving mini-motorised cars, which were customised Ed Hardy by Christian Audigier and later tucked into a yellow truck-shaped cake.

Guests included Britney's mother Lynne, father Jamie, sister Jamie Lynn and her new baby Maddie, Jenny McCarthy and her son Evan, and Gwen Stefani's eldest child Kingston.