As Chris Brown continues his stint in rehab, girlfriend Karrueche Tran appears to be competing with Rihanna for best bikini body in a recent Instagram war.

Recently, Karrueche Tran updated the world after spending Christmas and New Year with Chris Brown with some scintillating Instagram bikini photos.

Although the love triangle between Rihanna, Chris Brown, and Karrueche Tran is reportedly long over, many fans believe that the Instagram update is a call out to Rihanna in her own bikini Instagram updates.

Rihanna is reportedly in Brazil and doing a bikini shoot for a magazine. Coincidentally, Karrueche Tran updated her Instagram with her own bikini photo around the same time.

Who do you think wins in the bikini competition: Rihanna or Karrueche Tran?

And as Chris Brown's ladies vie for sexiest body, the "Fine China" singer is taking the time to give Justin Bieber some relationship advice.

“[Chris] is able to love and he’s more thankful for Karrueche because she’s the real deal; she’s down for him and loves him through all his turn ups and turn downs,” said a source to HollywoodLife.

“He knows Justin has Selena and she’s in the biz, and he told him months ago to keep her. He flat out told Justin that Selena is a keeper. He told the little homie not to be like him and stop bullsh–ting with her. He told this man they belong together.”

Currently Bieber is going through his own legal troubles are being investigated for drug possession and egging a neighbor's house, and Selena Gomez is reportedly sticking by her man.

“Lupus is triggered by stress and anxiety, and right now Selena is completely stressed about Justin and this whole egging nightmare. She’s worried sick about him, but at the same time won’t leave him. She’s basically picking Justin over her own wellbeing.”