During a taped episode of "Monday Night RAW" last night in Los Angeles, Britney Spears' husband Kevin Federline made a surprise appearance in the ring and received a chorus of boos from the sold-out crowd at the Staples Center.

After an argument between Kevin Federline and Cena got a little physical, Cena unleashed his signature move -- the F-U slam -- on Mr. Britney Spears.

In this clip from TMZ, Kevin Federline, sporting his traditional white t-shirt and jeans, makes his way to the ring to a chorus of boos -- and meets John Cena when he gets there.