Hot Victoria's Secret models don't expect their boyfriends to pee their pants at music festivals for all the world to see, yet that's exactly what happened to Alessandra Ambrosio last night at the Neon Carnival at Coachella!

Yes, the model's cute Italian b-friend literally wet his pants, hence the huge pee stain we exposed when we snapped the couple leaving the carnival Saturday night. Ambrosio looked embarrassed and Italian stallion Nicolo Oddi appeared to be trying to pass off the huge wet spot as nothing. But we're on to you, dude!