On Sunday, (after debuting her "River Island" collection at London's Fashion Week and being attacked by a Chris Brown fan) 24 year-old Rihanna has decided to celebrate her 25th Birthday just a little early, as she jetted to Hawaii with her bestie Melissa Forde and mentor/bestie Jen Rosales.

The Elle Magazine Cover Girl stripped down to a peach Andie two-piece bikini while smoking a blunt yesterday, getting ready to hit the town for her week long B-day celebrations.

And according to Rihanna,

"...already started celebrating MY birthday!!! Haa#PoItUpPoItUp

They got the memo #birthdaybehavior..."

Rih's official birthday is Feb. 20th.

BONUS:

On Sunday, the 24 year-old 'Stay' singer shared a few pics of her private B-day home in Hawaii with Jenn. Check out the pics below:



image credit: Instagram/Twitter