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Rihanna, Rob Kardashian, Rita Ora

Frazer Harrison/Getty Images; Isaac Brekken/Getty Images; Alan Chapman/WireImage

Rob Kardashian obviously has a way with the ladies.

After all, the E! star has recently been spotted spending time with both Rihanna and Rita Ora.

So it was really no surprise that the gals came up in conversation when Kardashian called in to Ryan Seacrest's KIIS-FM radio program on Tuesday morning.

First up, the sighting over the weekend of Kardashian not only go-karting with Rihanna in Burbank, Calif., but later partying with the Barbadian beauty at Hollywood's Playhouse nightclub:

"It's because Rihanna's a friend, and she is friends with my friend Capricorn, and it was Cap's birthday," Kardashian explained. "We all went out to celebrate our friend's birthday. It was fun. It was a good night."

Very well. But what did he have to say about Ora, the British songstress he is rumored to be dating?

"I'm just a fan. That's all. I'm a big fan," Kardashian simply said, before quickly changing the subject by commenting, "I wish you could buy U.K. albums here."

Hmm, guess time will tell what's really going on between those two fake-tattoo-wearing kids.

Don't miss all-new episodes of Keeping Up With the Kardashians, Sundays at 9 p.m. on E!