(Photos from left: Slaven Vlasic/Getty Images, Frazer Harrison/Getty Images)

No one would think it was a surprise that musician Rita Ora has moved on just weeks after getting the boot from Rob Kardashian. Now that Rob K let her go for being very, uh, giving to guys of the entertainment industry, she has reportedly moved to Diana Ross’s son, Evan.

The two were spotted smooching at a Manhattan party on Sunday, even taking a “lingering passionate kiss,” says a witness. Unfortunately for Rob K, Ross is one of the dudes Ora was rumored to have been seeing while dating him.

Is this a long-term thing? We’d have to bet that, in the dating roulette world of Hollywood, it isn’t. Then, again, their young, famous and fabulous. Enjoy!

Both Evan Ross and Mario showed up at Maxim’s 2008 Hot 100 Party in L.A. yesterday. Which of these (seemingly) sensitive guys can get it?