Rihanna planting a kiss on Rita Ora back in May. (Photo : Twitter: @RitaOra)

Robert Kardashian is quite the ladies' man these days. The youngest Kardashian has been romantically linked to new artist Rita Ora since late 2011 but now he is rumored to have also started something special with Rihanna.

Rihanna and Kardashian were spotted hanging out last Saturday (August 25) racing and clubbing. Seems like a fun date for the two. The 24-year-old pop star and 25-year-old reality star went go-kart racing at Racer's Edge Indoor Karting in Burbank California. They ended their night at Playhouse nightclub in Hollywood. The unusual pair was tailed by paparazzi throughout the day and was clearly trying to avoid being photographed together. Is this a secret romance?

Although Kardashian and Ora's relationship has never been confirmed, the pair has made it obvious that they were an item. A photo of the duo flaunting fake tattoos of each other's name on their hands fueled the dating rumors even more. "Rob's family make their lives public," Ora told Glamour last month. "Me? I'm very private. He's a great friend. But the only relationship I'm having now is with the tour bus."

Rob Kardashian and Rita Ora

Kardashian seems to have eyes only for Ora - well for her tweets at least. Ora's Twitter account is the only one Kardashian is following. He has also deleted most of his tweets (something Rihanna's "true love" Chris Brown is known for doing. maybe Rihanna sees similarities between the two.)  Kardashian has been supporting his lady friend's release of her debut album, Ora.

The 25-year-old supposed bachelor tried to set the record straight during a Tuesday (August 28) interview with Ryan Seacrest on KIIS-FM. He explained that his Saturday outing with Rihanna was for a mutual friend's birthday party. "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." When asked about his status with Ora, Kardashian coyly responded "I'm just a fan. That's all. I'm a big fan."  He then quickly changed the subject.

Despite the ambiguity of who his main squeeze actually is, there is one lady who is making him know it's real. A photo of a mystery woman with "Robert" tattooed across the back of her shoulder was uploaded by Kardashian.

He captioned the post with "#tattmynameonya" referring to a song by Rihanna's ex-boytoy Drake. Oh what a tangled web of love. 

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