.
The singer, 23, pins a fellow reveller against the back of a van with a booty-shaking routine.
The scorching scenes came amid a day out that saw her party in just a cutaway bra.
Minutes later another enthusiastic friend grabbed the songbird's boobs.
Soaking up the fun ... eager fan grabs Rihanna's chest and, right, star needs her umbrella-ella-ella
Xclusive PixBut the partying appeared to have eventually caught up with the star as she was later seen slumped on a bikini-clad girl's lap.
She stoops to conquer ... Rihanna - wearing what looks like a king's headdress - blows a kiss and waves to festival-goers on a float
SplashWhat's My Name? and Umbrella singer Ri jetted home over the weekend.
And despite a downpour she loved the atmosphere of Grand Kadooment Day, the finale of the Crop Over Festival Season.
Lapping up the fun ... Rihanna
Splash NewsRihanna is working on her sixth album and her first film, Battleship, is due to be released next year.
Is this her idea of what they wear on battleships? Or did someone tell her to wear a navel uniform?
Worn out ... Rihanna leans on scantily-clad pal
