Paris Hilton celebrated Paris Hilton Day in Las Vegas, Nev., by partying the night away at Caesars Palace’s Pure nightclub with former boyfriend Chad Muska.

On Tuesday the mayor of the city made the official declaration and presented the aspiring singer with a key to Sin City.

After proclaiming that Las Vegas was her “favorite place in the world to come to party,” Hilton then carried on with the former pro skateboarder.

The two dirty-danced the night away, grinding, groping and even kissing for the cameras.

Hilton has obviously forgiven Muska for making a rude comment about her sister Nicky earlier this month.

While Muska was acting as a guest DJ at Hollywood hotspot Hyde he made an inappropriate comment, which caused Nicky’s boyfriend, “Entourage” actor Kevin Connolly, to punch him in the face.

The group seemed to have kissed and made up, with Nicky being seen partying along with the couple.