Paris Hilton was a no-show at sometimes best friend Kim Kardashian’s birthday party in Las Vegas on Friday, and the word is that the two are best friends no more because of a clash of egos.

Kardashian didn’t want to be clubbing in the partying heiress’s shadow — and Hilton was miffed that her less-famous friend was being called the New Paris, according to various sources — including Kardashian’s former publicist.

Kim Kardashian’s ex-rep, Jonathan Jaxson noted on his blog:

“Even when I would talk to editors of magazines and other media outlets about featuring Kim, they would comment on how they are moving past Paris in hopes to bring someone fresh to the spotlight, like Kim,”