There’s never not a “right” time to show some skin when it comes to Rihanna, but what better day than your birthday? Birthday suit for the birthday girl, right? We’ve been privvy to most of Rih’s tattoos up until now…”Love” on her finger, stars on her back, “Shhh” on another finger, a date in roman numerals on her shoulder, the list goes on. But today we’ve spotted one that up until now, we didn’t know was there! Check out her ink via a sexy bikini pic in the gallery.