Well, that's definitely different for the house of the Lord.

Britney Spears and boyfriend David Lucado were spotted going to church hand-in-hand on Sunday in Thousand Oaks, California -- where she wore a very risque outfit.

Sporting a very short (and very tight) dress, Spears put her curvy figure and legs on display ... pairing the look with some knee-high black boots and an untamed head of hair.

At one point, she even had to hold the dress down, as it kept riding up!

Lucado looked a little better put together, wearing a vest, dress shirt and tie. He also finally lost the hat he's always seen wearing when the two usually step out together.