Rihanna was pictured "flirting outrageously" with model Dudley O'Shaughnessy during the video shoot of her next single.
The 23-year-old R and B singer is said to have hand-picked the amateur boxing champ for her next single 'We Found Love'.
"Rihanna was making no secret that she fancied the pants off Dudley. They hit it off straight away," the Sun quoted a source as saying.
"She had seen his modelling shots and other pictures when he was a boxer.
"Rihanna took every opportunity to get close to him and at one point she was sitting in his lap during a break from filming.
"She's very tactile anyway, but this was something else.
"Dudley was giggling like a schoolboy when she had to shoot a scene in a see-through top.
"She was teasing him with a peek at her cleavage and winking at him.
"Dudley can't believe his luck. Rihanna's girlfriends are teasing her, singing songs about her romance," the source added.
The 'Umbrella' hitmaker's last long-term boyfriend was rapper Chris Brown, with whom she split after he assaulted her.