Boys Will Be Boys! Chris Brown Leaves Rihanna On The Sideline For Moped Fun With Sean Kingston

Chris Brown may have spent the best part of the week getting mushy with birthday girl Rihanna – but the singer decided to ditch the star for some one-on-one time with the fellas as he continued to holiday in Hawaii.  We’re sure RiRi understands!

Chris was spotted with his pal Sean Kingston as the two cruised the island on a pair of scooters just a day after Rihanna’s 25th birthday.

Chris Brown and Sean Kingston get ready to take off on their mopeds (BWSB Splash News)

And it looked like the ‘Turn The Music Up’ star was up for some friendly competition zipping past the ‘Beautiful Girls’ singer on a black scooter with a mean stare.

The pair were joined by a handful of pals as they parked up on the roadside together joking and laughing before heading off for another spin around the block.

On Wednesday, Chris joined his girlfriend Rihanna to celebrate her 25th with a small group of family and friends on the tropical island with a low-key party. RiRi later tweeted a photo of herself looking totally loved-up with the R&B star.

According to sources, the ‘Diamonds’ singer’s quite bash was just perfect and she was left in awe of the love coming from everyone who made it.

“Rihanna just chilled the whole day with Chris and didn’t want to be bothered — she was having the time of her life, turning 25 and was turned up the whole damn day,” a source told HollywoodLife.

“She didn’t have a care in the world.”

The source continued: “Everybody that is important to her, all the people in her life that mean something to her, came out and showed her love.”