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(USA TODAY) -- Model Kate Upton is joining Jennifer Lawrence in an effort to catch privacy violators.

More specifically, the parties responsible for uploading nude photos of the stars to the Web.

Representatives for supermodel-turned-actress Upton, 22, and Lawrence, 24, who plays heroine Katniss Everdeen in the Hunger Games movie franchise and is an Oscar winner for her role in Silver Linings Playbook, are speaking out about intimate pictures which first appeared on image-sharing site 4Chan over the weekend.

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"The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence," the movie star's reps Bryna Rifkin and Liz Mahoney said in a statement.

Upton's lawyer, Lawrence Shire, issued a similar statement to Us magazine: "This is obviously an outrageous violation of our client Kate Upton's privacy." He added, "We intend to pursue anyone disseminating or duplicating these illegally obtained images to the fullest extent possible."

Other celebs targeted in the leak include: Nickelodeon's Victoria Justice, Sky High and Final Destination 3 actress Mary Elizabeth Winstead, pop star Ariana Grande and actress Kirsten Dunst.

The FBI told the Associated Press on Monday that it was addressing allegations that online accounts of several celebrities, including Oscar-winner Jennifer Lawrence, had been hacked, leading to the posting of their nude photographs online. And Apple Inc. spokeswoman Natalie Kerris said the company was investigating whether any iCloud accounts were compromised, according to the AP.

Justice took to Twitter to deny the authenticity of the photos that appeared to be of her. She wrote: "These so called nudes of me are FAKE people. Let me nip this in the bud right now. *pun intended*"

But Winstead scolded those who looked at her shots, and said she felt for the other stars affected.

Dunst tweeted some words, perhaps acknowledging a potential cause of the leaked images: 'Thank you iCloud."

The authenticity of the other photos has not been verified. No word yet on how the images made it to the Web or if the FBI, which investigated previous cases of leaked star photos, is involved.

After the images appeared, Engadget, a Web magazine that covers consumer electronics and technology, reported that Apple has fixed a bug that could have enabled hackers to gain access to iCloud accounts — and then potentially leak nude photos of celebrities — according to a tech report Monday.

According to Engadget, the Find My iPhone software was recently found to have been vulnerable to hackers who repeatedly try different passwords, seeking one that provides entry.

Contributing: Alison Maxwell and Kevin McCoy

PHOTOS: Celebs' phones hacked:

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