The People can reveal that the England and Manchester United defender has been trying to get his tackle in with luscious Tatiane Rosalino, who posed as cyberbabe Lara Croft for a photo shoot based on the movie Tomb Raider.
But Rio's devoted girlfriend Rebecca Ellison will cry foul and blow up when she finds out what he's been doing behind her back.
His pal told The People: "Rio has a lot of time for Rebecca but temptation is put in his way all the time. She won't be happy when she finds out he's fallen for this model."