Riri dominated Rob completely with her number 16 kart.
The cheeky star, 24, raised the one-fingered salute on her way out of a go-karting track in California.
Rihanna and Rob Kardashian were spotted on Saturday going to the Racer’s Edge Indoor Karting in Burbank, Calif.
Rihanna wore black hot pants, Converse trainers and a funky oversized lacy letterman’s jacket for the occasion.
Rob, on the other hand, wore a pair of brown chinos and a grey vest.
Apparently, the star is dating singer Rita Ora, who is very much compared to Rihanna most of the time.
The ever versatile star – wearing her trademark red lippy – then changed from her battered sneakers into sexy thigh-high boots for the club.
When she left the go-karting track Rihanna made an obscene gesture, raising her middle finger to the photographers.
After the karting fun, Rob and Rihanna decided to continue the fun and went to Hollywood hotspot the Playhouse for drinks, according to the Daily Mail.
So the pair donned helmets and raced round the Racer’s Edge track at full pelt.
Rihanna wore black hot pants, Converse trainers and a funky broderie anglaise baseball jacket to enjoy the sport.