The 23-year-old singer is said to have been 'flirting outrageously' with Dudley O'Shaughnessy who was an Olympic boxing hopeful before he signed with a modeling agency two years ago.
According to The Sun, she handpicked him for next single We Found Love, and enjoyed getting tactile with him on the shoot in Northern Ireland.
A source said, 'Rihanna was making no secret that she fancied the pants off Dudley. They hit it off straight away.
'She had seen his modeling 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 on 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.'