Britney Spears' dancer husband Kevin Federline became the butt of mockery on Saturday night at the hands of the 'Punk'd' host Ashton Kutcher.

According to Contactmusic.com, Kutcher stripped down to his underwear to play Federline in a fake TV ad on US comedy show Saturday Night Live.

Rolling around a bed wearing just a white pair of boxer-briefs with 'Federline' boldly spelt across the band, Kutcher remarked, "I look like I might stink, yo, but I don't... Britney thinks I look best in my underwear. By the way, Britney keeps her underwear over there and over here, and over there in that big pile. Most of the time she keeps 'em in my mouth.", the report quoted him as saying.