RIHANNA spent pretty much all day Saturday with ROB KARDASHIAN. First they rode go-karts at Racer's Edge Indoor Karting in Burbank . . . where witnesses say Rihanna left Rob in the dust in race after race.
--Then they hit up the Playhouse nightclub in Hollywood.
--They were NOT interested in being photographed together, because they entered and left the club separately. (--Here are some pics.) (Radar Online)
--Also, Rob has a GIRLFRIEND. He's been dating singer RITA ORA since December . . . and TMZ says they recently got each other's names tattooed on their hands. (--Rihanna is 24. Rob is 25.)
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