If Katy Perry wasn't a famous singer/songwriter then she would make a GREAT game show host!
Ellen Degeneres made Katy's teenage dream come true when she gave her the opportunity to host her own game show, Grab Ellen's Bust, today on Ellen!
We bet that three-piece suit made John Mayer think dirty, dirty thoughts about his lady love.
Ch-ch-check out Katy swap her cupcake bra in for a mustache and toupee (above)!!!
Tags: ellen degeneres, game show, guest, host, katy perry, talk show, the ellen show