Paris Hilton has slammed her former pal Kim Kardahsian for having a “cottage cheese butt.” The socialite made the comments Monday on a Las Vegas radio show.

“I would not want [Kim’s butt] it’s gross! It reminds me of cottage cheese inside a big trash bag,” Hilton said.

Apparently, the 26-year-old regretted her comments as she told In Touch magazine that she had already apologized to the reality star. “I was just joking around and I made a stupid joke. I felt really bad afterward, so I contacted Kim and apologized. It was a silly thing to say. Kim’s hot!” Hilton told the magazine.

Meanwhile, Hilton is touring with her boyfriend Benji Madden and his band ‘Good Charlotte.’