Yes, long ago Katy Perry (formerly known as Katy Hudson) once sang along side the icon band P.O.D.! Katy was a featured vocalist on their song "Goodbye For Now" and was featured in their music video (seen above at 3:26). She even joined them on stage to perform the song on Jay Leno.
What do you think ONTD? Should she have stayed in Christian rock obscurity or are you a fan of her current schtick?