Via The Sun:
Rihanna placed a friendly hand on party pal Cara Delevingne’s bum during a tequila-fueled boat party.
The singer was spotted standing with her palm firmly placed on her friend’s bikini-clad backside as they laughed and joked with friends on board a luxury yacht.
Rihanna, who was wearing a low-cut black swimsuit, which had her initial R emblazoned on the back, and Cara, 20, who wore a black and white two-piece, were snapped as they partied off the coast of Monaco on Friday.
They were seen downing shots of what appeared to be tequila.
And they also took turns going for a ride on an inflatable rubber ring.
Unfortunately for 25-year-old Rihanna, her swimsuit rode up rather a lot as the ring bounced across the sea.
And as she was helped back on to the boat she was sporting a Rih-lly painful-looking wedgie…