BIRTHDAY CAKE...RIHANNA CELEBRATES HER 25TH BIRTHDAY IN HAWAII WITH CHRIS BROWN

Pour it up...Pour it up..Rihanna holds onto her boyfriend Chris Brown's hand while taking a stroll along the beach on Wednesday in Oahu, Hawaii. living it up for her 25th birthday, and has no worries about what folks have to say about it.  Check out a pics of Chris Brown popping up on her Hawaiian vacay.

We're sure that "Birthday Cake" remix will get played...and re-enacted...more than a few times on this trip.  That's how they ball out.