Britney Spears and Kevin Federline are reportedly reviving their relationship with some down right dirty talk over the phone.  

According to a UK publication, the calls are far from a friendly chat once in a while, with their steamy sessions racking up lengthy phone bills.

A source tells The News Of The World, "It's early days, but there is certainly still something between them.

"They’ve been talking dirty over the phone and about how much they'd loved each other and how it all went wrong.

"They now speak at least every other day and Brit makes excuses to call Kevin, saying it's about the boys.

“He thinks she is getting back to her old self. But they're worried what it must look like after their break- up descended into such a bitter divorce.

“They want to keep it to themselves to see how well they're getting on before making any grand announcements."

See Britney strutting her stuff in her new video here