The couple hit up Racer's Edge Indoor Karting in Burbank to burn some rubber before rounding off the night at Playhouse nightclub in Hollywood.
The singer, 24, showed off her need for speed as she thrashed Kardashian on the race track, dominating him in race after race.
Rob and Rihanna clearly did not want to be pictured in each other's company, as they entered and left the club separately, Rihanna offering a one fingered salute to the waiting paparazzi.
Maybe Rob didn't want his girlfriend to know he was hanging with another lady.
Kim's little brother has been dating singer Rita Ora since last December.
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