Britney Spears Says "Who's Keira Knightley?"

As if the drama surrounding her custody battle with Kevin Federline isn't enough, Britney Spears has decided to engage in a little back-and-forth with Pirates of the Caribbean actress Keira Knightley.

It was actually Keira who got the ball rolling, as the British starlet voiced her disapproval over female celebrities (Britney Spears, Paris Hilton, etc) who expose a little too much of themselves to the paparazzi during their nights on the town.

“They’re real people proving they’re sluttier than everybody else because they don’t even wear knickers,” said Keira, who's currently promoting her new movie "Atonement" at the Venice Film Festival.

Soon enough, Britney was asked to share her opinion of Ms Knightley's recent comments. And rather than let it die right there, Britney offered up the dismissive insult, “Who’s Keira Knightley?”

When informed that Keira is a well known Hollywood actress, Brit replied, “I guess she must need the publicity.”

Gossip Girls

Enjoy the pictures of Britney at a Hollywood Dance studio on Thursday (August 30).