Rihanna Bikini PHOTOS: Twerks & Flaunts Sexy Pink Swimsuit, Ex-Boyfriends Drake & Chris Brown 'Turned-On,' What About Eminem 'The Monster' Tour Crush?

Rihanna just wrapped-up this summer's highly-anticipated "The Monster" Tour alongside rapper Eminem. So, how's the best way to celebrate?

By flaunting her killer bikini body aboard a luxury yacht in St. Tropez - of course!

First, the "Diamonds" beauty was caught twerking with gal pals on the gorgeous ocean getaway:

Impressive. Just a few days later, RiRi was spotted soaking up the sun in a racy pink bikini - check out those tan lines.

So, are ex-boyfriends Chris Brown and Drake "competing" for the Barbadian songstress' attention? An alleged source for Urban Islandz suggests that Drizzy might be having better luck with that so far:

"Drake reached out to RiRi while he was in NYC so it was just innocentfun together, there is no bitterness between them or anything like that... Both Drizzy and Chris are competing for Rihanna's attention, but she is just focusing on her career right now."

And what do the former lovers miss most about RiRi? Her carefree, sexual attitude:

"That sex appeal. That passion in bed. [Drake] misses all that and wouldn't mind hopping on the ride for the next month or so and turning up with her," (via Hollywood Life).

Rihanna's definitely a heartbreaker - rumors even suggest that Slim Shady grew a little crush while touring with the "We Found Love" superstar! Should RiRi settle down again soon, or continue enjoying the fun-and-free single life?