Happy 25th Birthday Rihanna! Singer Vacations In Hawaii…

Rihanna turns 25 today, and just how is she celebrating? Vacationing in Hawaii, of course.

The singer is not only frolicking on the beaches of the beautiful island, she’s doing when she does best, smoking and lounging around in her bikini. Well, how else would you celebrate your 25th birthday?!

She also posted this photo showing off her cropped knot knot tank from her River Island collection, which made it’s debut over the weekend.

She tweeted, “I know you want my cropped knot tank #RIHforRiverIsland”

Check out these photos courtesy of Rihanna’s best friend Melissa Forde.

And here’s the money shot.

And…

Ass! We wonder what the tattoo means.

It was also on this day last year that Rihanna and on-again boyfriend, also rumored to be with Rihanna in Hawaii, released single “Birthday Cake”. I wonder what they have in store for us this year.

Happy birthday Rihanna!