Kevin Federline has personally warned Paris Hilton to stay away from his ex-wife Britney Spears, reports say.K-Fed, who has two children with Britney, told the hotel heiress and reality TV star to leave Spears alone, as he sees her as a bad influence.Kevin reportedly told Paris at club Lavo in Las Vegas, that he does not want Britney to return to her troubled lifestyle after her successful return at this year's MTV Video Music Awards.

"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," a source told The Daily Star.

Britney and Paris where notoriously spotted on the Los Angeles party scene in 2006, along with Lindsay Lohan, often pictured flashing photographers while wearing no underwear.

Last week, Britney threw a joint truck-themed birthday party for her children Sean Preston, who turned three on September 14 and Jayden James, who was two on September 12.