The ever versatile star – wearing her trademark red lippy – then changed from her battered sneakers into sexy thigh-high boots for the club.

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The cheeky star, 24, raised the one-fingered salute on her way out of a go-karting track in California.

Ri-Ri was enjoying a night of fun with celebrity pal Rob Kardashian.

Rob, 25, is currently dating Rihanna mini-me Rita Ora but he is also good mates with her record label buddy.

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.

While Rob chose a slightly more sensible pair of brown chinos and a grey vest.

The fast-paced fun then continued – as the twosome headed to Hollywood hotspot the Playhouse for drinks.

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.