Paris Hilton has received a harsh warning from Kevin Federline to stay away from his ex-wife, Britney Spears.

K-Fed reportedly told Brit's former party pal to keep her distance as the pair chatted in club Lavo in Las Vegas.

"It was quite a chilling warning," an onlooker tells the Daily Star.

"She was quite friendly and asked how Britney and the kids are but she won’t be asking again."

Britney and Paris spent a brief time partying and forgetting their underwear together shortly before the troubled pop star went into full meltdown.

Although the girls haven't been seen out together recently, Paris has praised her pal on several occasions for getting through her troubles.

Kevin and Britney divorced in 2006 and have two children, Sean Preston and Jayden James.

See Britney losing the plot in 2007 here