Instead of having a huge party at some Las Vegas nightclub, Rihanna decided to ring in her 25th birthday with a leisurely stroll along the beaches of Hawaii, and she wasn't alone.

The 'Unapologetic' singer brought her on-again beau Chris Brown to enjoy the tropical scenery.

“Pour it up pour it up! #birthdaybehavior,” she wrote on the photo she posted to Instagram, which showed the pair seated in what appears to be a limo -- with RiRi on CB's lap.

Aside from her birthday, RiRi revealed that 'Stay' has soared to the third spot on the Billboard Hot 100 chart. “#epic day already, I woke up to sunshine in paradise and #STAY done jumped 54 spots to #3 on the BillboardHot100!!” she tweeted.

What do you think of Rihanna's birthday plans? Tell us in the comments below.

Check out photos of Rihanna's romantic walk with Chris Brown.

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