Seeing Britney Spears nude is hardly a rarity any more.

But our supposedly rehabbed girl surprised even us the other night. According to the Superficial, Britney changed outfits... while partying with friends at hot Club Winston.

Instead of staying home with little Jayden James (heaven forbid) Friday, our girl was spotted at the club... where she ended up switching clothes with a girlfriend midway through the night.

At least there was no crotch shot or nipple slip. So you can consider this spectacle a success. Anyway, check out the magical Britney Spears outfit swap below ...

That's the kind of stuff you have to deal with when you're Britney Spears' friend... one that looks like a trashier (if that's possible) Paris Hilton clone.

This girl (who, surprisingly, is not Brit's cousin Alli Sims) should just be thankful that Britney Spears wasn't wearing a worse outfit. It's not like you can say no to her when she pouts.We know how it is. What Britney Spears wants, Britney Spears gets.

Just ask J.R. Rotem.