Hahaha. Ross telling wifey to beat it (*Bonus points to Jordana for pulling the "You're in trouble" face that eventually inspired Dashiell's infamous "Whatchoo talking 'bout, Willis?" look
Ross has a Philip Roth-esque crush on everyone's favorite pop shiksa, so Jord thought it would be funny to have Britney come perform a lil' birthday dance for the birthday man.