I'm guessing that Christina Aguilera is everywhere these days because she's out promoting some album that I will never ever hear ever. Here she is in yet another sexy clown costume outside the Letterman studios last night. This one isn't as bad as some of the other crap she's been wearing this week, but there's something about a chick who reminds me of the circus that just doesn't do it for me. Clowns are scary.     Related Articles: Christina Aguilera Doesn't Keep Getting Better Christina Aguilera's Greatest Tits, I Mean Hits Promo Pics Christina Aguilera Breasts Can't Save That Old Lady Outfit Christina Aguilera Does Lady GaGa Photos: WENN.com