Looks like they're back on again. Rihanna turned 25 yesterday and spent in with her (we have no idea what he is to her) Chris Brown. 

Rihanna turned a quarter of a century with one of her favorite people in the world: Chris Brown. Celebrating her 25th birthday on Wednesday, Feb. 20, the "Stay" singer was on the beach in Hawaii with her boyfriend Brown, 23, where the couple were photographed holding hands during an oceanside stroll and then snuggling by the surf. (Also quite noticeable: In one photo, Rihanna holds what appears to be two blunts.)

The songstress gave a sneak peak of her world-famous booty, wearing pink bikini bottoms, concealed only slightly by a mesh cover-up skirt, plus a black tank-top covering up her bikini top. "#epic day already, I woke up to sunshine in paradise and #STAY done jumped 54 spots to #3 on the BillboardHot100!!" she tweeted to her 28 million followers. "Walked up into #2013 like I owned a ho." - USWeekly 

 

Rihanna also posted a picture on Instagram of the two in a limo... she looked very happy. 

 

Update: Rihanna just posted a ton of birthay pictures on her instagram... she looked flawless. This was one of them: