Um, ouch!

Check out the awful sunburn Kim Kardashian got after falling asleep in the sun, while vacationing in Mexico in Thursday.

"I was sunbathing when I fell asleep with my huge Prada butterfly sunglasses on and now look at me!" she wrote on her Twitter page. "I'm going to have to hide from cameras for days. I usually never get red, I always get dark. It hurts!"

Wow -- she really does look ridiculous -- and we're not the only ones who think so.

Kim adds, "Everyone here is making fun of me! Look at [my boyfriend Reggie Bush]'s teammate and friend Bobby starting with the jokes. My whole body is burned, but my face looks the worst because of the glasses. I will never wear sunglasses when sunbathing again!"

How 'bout trying some sunscreen?!