Rapper Nicki Minaj is putting Instagram.com's ban on explicit photos to the test after sharing a topless shot of herself online.

The Starships hitmaker, who is known for her penchant to go bra-less, stunned fans on Thursday (17Oct13) when she uploaded a series of revealing images showing her wearing a bunch of chunky gold chains around her neck with just a pair of leopard-print, star-shaped nipple covers, aka pasties, to preserve her modesty.

In one caption, she referred to her newly-launched fashion line and wrote, "Should I add Pasties to the Spring Collection????"

Instagram's terms of use state that users "may not post violent, nude, partially nude, discriminatory, unlawful, infringing, hateful, pornographic or sexually suggestive photos or other content via the Service" - but the rapper's photos remained online as Wenn went to press.

Minaj is not shy about her assets - she accidentally flashed her boob on Tuesday (15Oct13) as she unveiled her clothing creations for U.S. department store Kmart in Los Angeles. The hip-hop star went bra-less and shirtless in a cobalt blue blazer, but struggled to keep her breasts fully under wraps as she posed on the red carpet.