The stunning superstar kept her stomach firmly under wraps with a blush jacket as she left a recording studio on Saturday evening.
In an earlier Instagram post she also kept her tum hidden in exactly the same way – with fans theorizing she was hiding a baby bump.
Giving a wave to photographers waiting for her outside the famous Milk Studios, she was toting a clear handbag – in it a very expensive Alexander Wang X Judith Leiber Swarovski clutch – as well as a pair of black strappy stilettos.
Rihanna and Toyota billionaire Hassan were first linked in June, after they were photographed making out in a swimming pool in Spain, and then were publicly spotted together only last month enjoying a cosy dinner in London at swanky Park Chinois Chinese restaurant.
On Saturday the Work hitmaker kept her head down as she left the studio, keeping her locks loose and curly and accessorising her revealing outfit with some simple gold hoops and gold pendants.
She kept her footwear simple with some chic blush trainers. On Thursday Rihanna was also seen keeping that tum behind a jacket.