01:21 - Source: CNN
Hollywood stars targeted in nude scandal

Story highlights

NEW: Some celebs "have engaged with the FBI" about the hacking, a U.S. official says

Apple says company is "actively investigating this report"

Online posts show nude photographs of actress Jennifer Lawrence

Other celebrities also report they were hacked, some say photos were doctored

(CNN) —  

“The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence,” the publicist said in a written statement.

Nude photographs of Lawrence, who won an Academy Award last year for her role in “Silver Linings Playbook,” were splashed on various sites Sunday. They appeared on 4chan, Reddit, Twitter and Tumblr, among others.

Kate Upton’s lawyer confirmed photos of the model-actress were among those leaked, calling it “an outrageous violation” of her privacy. “We intend to pursue anyone disseminating or duplicating these illegally obtained images to the fullest extent possible,” attorney Lawrence Shire said.

Lawrence’s publicist said “authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence.”

Some of the alleged victims in the celebrity hacking case “have engaged with the FBI,” a U.S. official told CNN’s Pamela Brown Monday.

The Los Angeles office of the FBI successfully investigated another hacker who stole nude photos, scripts and personal information from the e-mail accounts of entertainers including Scarlett Johansson, Mila Kunis and Christina Aguilera in 2011.

“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,” FBI spokeswoman Laura Eimiller said Monday. “Any further comment would be inappropriate at this time.”

Who’s at fault over nude photo hack

The previous case, which resulted in a Florida man being sentenced to 10 years in prison, involved hacking through the “forgot my password” function on celebrity e-mail accounts. Cyber-security experts are now pointing the finger at a flaw in Apple’s “Find My Phone” app that opened access to celebrities’ data stored in iCloud.

Apple confirmed to CNN Monday that it is looking into reports that its popular iCloud online data backup service may have been compromised by the hackers.

“We take user privacy very seriously and are actively investigating this report,”  Apple spokeswoman Natalie Kerris said.

Actress Kirsten Dunst, one of the hacker’s targets, tweeted “Thank you iCloud.” She added emoticons that graphically expressed her dissatisfaction with the service.

Twitter posts on verified accounts of several other celebrities Sunday also reported hacks.

“Upon further reflection and just sitting with my actions, I don’t feel comfortable even keeping the censored photos up. I am removing them,” Hilton tweeted. “At work we often have to make quick decisions. I made a really bad one today.”

The leaked photos sparked an online backlash, with some of the targeted celebrities decrying them as fake while others confirmed they’re real.

“To those of you looking at photos I took with my husband years ago in the privacy of our home, hope you feel great about yourselves,” actress Mary E. Winstead wrote.

“Knowing those photos were deleted long ago, I can only imagine the creepy effort that went into this. Feeling for everyone who got hacked.”

Some celebrities claimed the photos were doctored.

An individual close to singer Ariana Grande told CNN photos claiming to show her are “completely fake.”

This isn’t the first time celebrities have accused hackers of stealing risque photos.

Two years ago, a judge sentenced Christopher Chaney of Florida to 10 years in federal prison for hacking the e-mail accounts of 50 entertainment industry figures.

The first real case of a celebrity hacking attack was in 2005 when hackers logged into Paris Hilton’s phone and stole photos of the reality star, Mikko Hypponen, chief research officer at computer security company F-Secure told CNN in 2011. Those hackers reportedly were able to break into Hilton’s phone by correctly guessing the not-so-secret answer to her security question, which was “tinkerbell,” the name of her pet Chihuahua.

At the time, the hackers broke into Hilton’s phone by guessing the not-so-secret answer to her security question, which was “tinkerbell” – the name of her pet Chihuahua.

How celebrities’ nude photos get leaked

CNN’s Catherine E. Shoichet, Faith Karimi, Bill Mears, Dan Simon, Rachel Wells, Dave Alsup and John D. Sutter contributed to this report.