Now THIS is the picture of a happy girl!

Rihanna spent her 25th birthday with beau Chris Brown in Hawaii.

The "Stay" songstress Tweeted the above photo with the following: "#Pour it up pour it up! #birthdaybehavior"

Aside from celebrating her big day in paradise, RiRi also Tweeted about the success of her latest single.

She Tweeted, "#epic day already, I woke up to sunshine in paradise and #STAY done jumped 54 spots to #3 on the BillboardHot100!! Walked up into #2013 like I owned a ho."

To make the day even better, it was announced that RiRi has teamed up with MAC cosmetics to release a new collection ... including a fabulous lipstick in her favorite shade of red. Loves it!