Britney Spears may want to carry on partying but an unlikely obstacle could be about to get in her way.

Apparently Kevin Federline is fed up of her trashy lifestyle and wants her to go into rehab for the skae of their kids.

Star magazine reports that K-Fed has tried "every possible angle" to get Britney to clean up her act.

He even threatened to take the kids off of her and has drafted in Britney�s mum Lynne to plead with her.

"He's afraid she's going to hurt herself," says a Star source.