Rihanna: Sheer Cover-Up for Bikini!

Rihanna covers up her bikini with a sexy sheer cover-up at the beach on Thursday (December 29) in Barbados.

The 23-year-old Barbadian singer angrily (and jokingly) tweeted, “The sun just went hiding somewhere, and I’m still not dark yet!!! Wtf.”

PHOTOS: Check out the latest pics of Rihanna

Rihanna just chose the next single for her latest album, Talk that Talk. “Ok DONE!!!” she wrote. “I like what I see…and decisions are MADE!!! #NEXTSINGLE … And we on da same page…(For the most part).”

Yesterday, Ri tweeted a hot photo of herself in a bikini.