Justin Bieber's Lambo Bottoms Out at Bumpy Church Service

Justin Bieber got bumpy service during a church service.

The Biebs was worshiping Wednesday in L.A. at the Saban Theatre ... while he was inside, a staffer struggled as he backed Justin's Lamborghini up into a driveway. The major downside to a Lambo -- a super low bumper.

Selena Gomez was also there but apparently arrived separately. Paps asked if it's too early to talk marriage. After all, the kids can't seem to get enough of each other ... with PDA galore.