Kara DioGuardi stole the show as Katrina Darrell a.k.a. Bikini Girl was onstage performing Mariah Carey's Vision of Love.
Kara interrupted mid-song, and started singing the song, much better than Darrell I might add.
Kara topped it all off by showing Bikini Girl that she can rock a bikini too when she pulled her dress apart revealing the tiny black bikini underneath!
