Paris Hilton apologizes to Kim Kardashian

Paris Hilton has apologized to former best friend Kim Kardashian after insulting her famous backside.

"I would not want [Kim's butt] - it's gross!" Paris, 27, told a Las Vegas radio show on April 14. "It reminds me of cottage cheese inside a big trash bag."

However, after the clip made its way onto the internet, Paris realized she went too far. "I was just joking around and I made a stupid joke," Paris tells In Touch magazine. "I felt really bad afterward, so I contacted Kim and apologized. It was a silly thing to say. Kim's hot!"

And Kardashian accepts Paris' apology. "Paris and I have been friends since we were kids and I'm glad she made the effort to say she's sorry," she said.