Selena Gomez: Surprise Performance ... For the Love of God!

Christian rock will never get hotter than Selena Gomez doing a surprise gig in the middle of a religious themed event.

Gomez surprised fans at an album release party for Christian group Hillsong Young & Free in downtown L.A. Gomez has long been a supporter of the Hillsong church, which also boasts Justin Bieber as a follower.

We're told Selena wrote the song "Nobody" with Shane Stevens to deliver one message -- that no one can love us like God.

The plan is to release the song on Christian radio and possibly cross over to mainstream.