Kevin Federline Hooks Up With Colin Farrell's Ex?

Britney Spears' ex-husband is embarking on another controversial romance - with the woman who once appeared on a sex tape with Irish movie hunk Colin Farrell.

The rapper/dancer was spotted dirty dancing with Nicole Narain at two Hollywood hotspots on Thursday night.

The couple "bumped and grinded" on the dancefloor at top club Vice before moving on to a party at another trendy hang-out, Opera.

A bystander who spotted the couple "letting it all hang out" at Financially Hung's Black Card Party at Vice says, "She was clearly making advances and he loved it."

"Federline kissed her on the cheek - but I think that was only because he knew all eyes were on him."

The couple left the club separately but hooked up again at Opera early on Friday morning.