{blackbabes} Rihanna Enjoys Topless Moment While Preparing to Hit the Stage in Atlanta-See the Instagram Pic

Rihanna doesn't even have to try to look sexy.

The pop star was photographed tonight while getting ready backstage for her concert in Atlanta on her Diamonds World Tour—and she looks flawless. Oh, and she's also pretty topless.

"Show time!! #DWT," she wrote. "#ATL is all miiiiiinnneee!!!! I want you on your WORST behavior!!! Tonight is all about you!!! #DiamondsWorldTour"

With her curls getting pinned and makeup ready to go, Ri-Ri was perched on her knees with nothing but a pair of bright yellow panties on and a towel in hand to cover up her chest.

Aside from her usual inner glow, Rihanna was showing off some major tan lines, which may be the result of her sunning herself yesterday in a tiny string bikini.

The Barbados-born beauty has more than yet another successful tour stop to celebrate tonight, too: Billboard announced that she had broken the record for most pop songs by one artist reaching the No. 1 spot after her single "Stay," featuring Mickey Ekko, became her 10th chart-topping hit.

"It's a big day in Billboard history!!!! We Rihwrite records over here! #youcantgetin…," she said. "I owe this to my fans and to Billboard! Thank you for the love! It's pretty major!…"

Congrats, Ri-Ri!