Rihanna Bikini Twerking [VIDEO]: Drake's Ex Smokes 'Blunt,' Shakes 'Shmoney Dance' Booty, Sexy Yacht Party Goes Viral [WATCH]

Summer may be coming to an end, but Rihanna's definitely keeping things hot-and-steamy!

The 26-year-old Barbadian beauty was recently spotted partying on a luxury yacht in Italy with a group of gal pals. RiRi's BFF Melissa Ford shared these viral Instagram snapshots of the "Pour It Up" songstress twerking her booty to Bobby Shmurda's hit tune "Hot N*gga." Of course, Drake's ex was spotted smoking some "mysterious" substance while flaunting her version of the "Shmoney Dance" - check it out:

mdollas11: "Shmoneyyyy #YachtEdition @leleboo_phucku #Robynnn @bobby_shmurda."

mdollas11: "Hot N*ggaz."

mdollas11: "Ahhhhhhhh ahh ahh #3stooges."

RiRi definitely stole the show in that skimpy string bikini. Especially when put into slow-mo:

mdollas11: "gett up out maa traapphouzee."

"The Monster" beauty's no longer on Instagram, but she's still turning major heads on the popular social networking site!

What do fans think of RiRi's sexy boat twerk-fest?