Risqué photos of a woman purported to be Rihanna hit the Internet on Friday afternoon, two days after nude photos of R&B singer Cassie leaked.. The pictures show the woman in various stages of undress and include one image of a man who resembles Rihanna's one-time boyfriend, Chris Brown. After blogger Perez Hilton suggested that Brown "must be responsible" for leaking the pics, a spokesperson for the singer denied the charge late Sunday.

"Rumors that images circulating on the web which purport to be provocative photos of Rihanna were 'leaked' by Chris Brown are both false and defamatory," read a statement from a spokesperson for Brown's label, Jive. The singer, who dated Rihanna for a year, has been charged with two felony counts in connection with an alleged altercation with Rihanna in February. "Chris has not released or 'leaked' any photos of Rihanna (or anyone else for that matter)," the statement continued.

Hilton did not provide any details linking Brown to the images, which include two close-ups of a woman who resembles Rihanna and has a similar hairstyle. 

The photos appear to be self-portrait nude photos of a woman shot in various hotel mirrors. None of the nude photos viewed by MTV News feature the woman's face. Another picture features a man who resembles Brown, shirtless but not nude, with lacy underwear on his head. The image is a bit blurry, but the man appears to have tattoos on his arms that resemble Brown's; his spokespeople did not comment on that image.

Last month, Brown pleaded not guilty to two felony charges of assault and making criminal threats stemming from his alleged altercation with Rihanna on the eve of this year's Grammy Awards.

Rihanna's label declined to comment on a report published by TMZ on Saturday claiming that Island Def Jam had sent at least one Web site that had published the photos a cease-and-desist letter, which refers to "unauthorized photos purported to be ... Rihanna." The letter reportedly demanded that the photos be removed from the site, calling the posting of the images a violation of "the artist's rights," though it did not confirm whether the images were actually of Rihanna.