Rihanna vs. Karrueche Tran Instagram/Twitter War: Sexy Bikini PHOTO 'Wins' Chris Brown Back, 'The Monster' Tour Beauty Shares Racy Eminem Panties Pic

By Danica Bellini, Mstars Associate Editor | Aug 18, 2014 08:38 AM EDT

Rihanna's too busy heating things up onstage alongside Eminem to worry about the fact that ex-boyfriend Chris Brown's apparently back together with on-and-off again sweetheart, Karrueche Tran.

But it's no wonder why Breezy can't get enough of his former lovers. Both ladies are extremely sexy - and aren't afraid to flaunt it!

On August 17, both Tran and RiRi shared rather head-turning snapshots on Instagram and Twitter.

RELATED: Karrueche Tran vs. Rihanna 'Beef' Squashed, Chris Brown Taken! Instagram 'MCM' Love Confirms Dating: 'We Love/Laugh/Fight, Complicated But That's Us'

Karrueche Tran & Chris Brown Baby? Instagram 'Love' Prompts Pregnancy Buzz, Family Support Goes Viral Amid Rihanna 'Beef' [PHOTOS]

The 26-year-old model donned her stunning body in a skimpy red-and-black bikini while partying in Las Vegas:

Meanwhile, "The Monster" tour beauty got a little more frisky...

@rihanna: "school. kills."

Yup - "role model" indeed! Notice that her tour-buddy's name is written right across the naughty "touching myself" pic ("Shady").

Looks like Tran and the 26-year-old songstress are in a viral social medial battle, and they don't even know it!

RiRi's racy snapshot already has more than 12,000 "likes" and counting, while Tran's less provocative photo's garnered 74,000+ fan "favorites." So, which beauty's winning?

RELATED:

Rihanna vs. Karrueche Tran Beef Calms, Chris Brown Dating Model AGAIN: Drake's Ex Confirms 'The Monster' Tour Single Status, Wants 'Real' Man?

YOU MIGHT ALSO LIKE

DON'T MISS

MOST SHARED