Did Britney Cheat on K-Fed?

Britney has been papped out with music producer J.R. Rotem since becoming a single gal again - but some are claiming they were an item before her divorce papers were even filed.

Her new playmate is working on her comeback album with her, but interestingly was mates with K-Fed before the couple split and produced a number of tracks on his universally panned album 'Playing With Fire'.

A source told American mag Star, J.R. worked with Kevin on his album and something started going on between him and Britney before she filed for divorce.

It's also been widely rumoured that Rotem dated Paris Hilton - who mysteriously seems to have given Britney her left arm back again, of late - when he worked on her album, 'Paris'.

The source added, It was nothing serious (between Rotem and Paris), just a few hookups. I bet a million dollars that J.R. tried to keep that a secret from Britney. She would probably flip out if she knew that hed romanced Paris first."

But while Britters and Rotem have definitely looked quite cosy of late another pal has come out and said there's no truth in the story she locked lips with him while she was still with K-Fed.

"There was definite chemistry between them but Britney waited until after they'd split, said the source.

But whether this will come as much consolation to K-Fed, we're not sure.

The wannabe rapper has been very quiet recently and those close to the action says it's because the former Mr Spears is busy gathering evidence against Brit for the custody battle of their children.

Something told us all along that the Brit/K-Fed union would one day get messy...

SLJ