Rihanna turns 27 years old today! In honor of the big day, we're taking a look back at her best bikini moments over the past few years. There's no question that Rihanna loves to show off her body in two-pieces, both on stage and while relaxing on vacation. She's worn tiny swimsuits almost everywhere, from Barbados to the South of France, and often shares the snaps on Instagram. Click through for Rihanna's best bikini pictures!