Keepin' it klassy!

On Friday Kim Kardashian posted the Instagram photo above and wrote, "Happy Birthday @riccardotisci17 I love you soooo much!!! Can't wait to celebrate with you tonight!!!!" But let's be honest -- she really should have captioned the pic, "I'm going to pretend to wish you a happy birthday, but what I really want is for every website in the world to post this picture of my giant booty and talk about what an attention wh*re I am!" And here we are...

The throwback picture was snapped during a fitting before Kim's wedding to rapper Kanye West, and we're not sure why she's wearing sheer black tights with no underwear, but we do know that she's self-absorbed and always looking for an excuse to post photos of her famous posterior, so this makes perfect sense!

Kim and Kanye are currently in Ibiza, Spain to celebrate the 40th birthday of Kanye's bestie, Givenchy creative director Riccardo Tisci, and apparently the big bash is tonight at Tisci's home.