Old rivalries die hard, and it seems Kelly Osbourne and Paris Hilton still haven’t quite buried the hatchet.

After seeing each other at the 2014 Coachella Valley Music and Arts Festival over the weekend, the “Fashion Police” host took to Twitter to slam the “Simple Life” starlet.

Kelly wrote, “@ParisHilton please grow up there is no need to act like a child you could of happily joined us! it's not 2005 no one cares!”

According to an eyewitness, “Kelly was sitting with some mates, minding her own business, when Paris suddenly started b*tching and moaning, and slagging her off. She was asked by someone else to join the group, but declined and swanned off. The pair didn’t speak for the rest of the weekend.”