Jennifer Lawrence's Leaked Nude Photo Sparks Controversy....

On Sunday, a user of anonymous Internet message board 4chan posted hundreds of nude photos of some of Hollywood's biggest celebrities, including actress Jennifer Lawrence and model Kate Upton. The poster claimed photos of Victoria Justice and Ariana Grande were included, but the singer/actresses deny that the photos are real.

Representatives and the women themselves have begun issuing their denials (in the case of Justice and Grande) and confirmations (in the case of Lawrence and Upton).

 A representative for Lawrence confirmed in an email to Buzzfeed that the images were stolen from the actress' iCloud account.

"This is a flagrant violation of privacy," the representative said. "The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence."

After illegally obtained nude photos of Jennifer Lawrence and other actresses were made public Sunday, the FBI is on the case -- and so is Lena Dunham.

"The way in which you share your body must be a CHOICE. Support these women and do not look at these pictures," the "Girls" creator and star said in a series of tweets Monday. "Remember, when you look at these pictures you are violating these women again and again. It's not okay."

She characterized the person who stole the pictures as a "sex offender," not a hacker.

"The 'don't take naked pics if you don't want them online' argument is the 'she was wearing a short skirt' of the web. Ugh," Dunham wrote.

"The FBI is aware of the allegations concerning computer intrusions and the unlawful release of material involving high profile individuals, and is addressing the matter,” Laura Eimiller, a Los Angeles spokeswoman for the bureau, told L.A. Now on Monday.