The Wrecking Ball star's five-month romance with Schwarzenegger, son of movie legend Arnold, is believed to have crumbled after he was spotted partying with a female friend during a vacation in Mexico last month (Mar15)

News of the separation emerged this week (beg20Apr15), and now Cyrus has been photographed kissing other revellers at a bash in Sin City on Thursday night (23Apr15).

Cyrus partied with stars including supermodel Cara Delevingne and Paris Hilton at the event, and pictures posted online by fashion photographer Mert Alas show the singer locking lips with a female friend, believed to be model Frankie Rayder, with the caption, "KISS night."

Another snap shows Cyrus kissing a man, believed to be Alas, with the caption, "L O V E".