On Sunday, August 31, a user of the website 4chan posted a list of more than 100 female stars who had supposedly been hacked in what is now being called the biggest celebrity hacking scandal in history. Throughout the remainder of the day, alleged photos of A-listers such as Kate Upton, Ariana Grande, Kirsten Dunst and -- perhaps most famously -- Jennifer Lawrence hit the site in droves, supposedly via an iCloud security leak that allowed a hacker to access their phones.

Update: Apple Releases Statement On Celebrity Phone Hacking

While the authenticity of many of the photos is yet to be addressed, some reps for the stars have already spoken out about their clients' violated privacy, thus confirming the seriousness of this hack.

"This is a flagrant violation of privacy," a spokesperson for Lawrence told The Hollywood Reporter. "The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence."

"This is obviously an outrageous violation of our client Kate Upton’s privacy," Upton's lawyer Lawrence Shire said in a statement. "We intend to pursue anyone disseminating or duplicating these illegally obtained images to the fullest extent possible."

For information and resources on how to prevent - or deal with - a hack, read more at A Thin Line

Meanwhile, a spokesman for Grande told Buzzfeed that the leaked photos of his client are fake -- and some stars, like Mary Elizabeth Winstead, "Glee"'s Becca Tobin, Olympic gymnast McKayla Maroney, and Victoria Justice, took to Twitter to address the hack:

Winstead said the photos had long since been deleted from her phone.

Tobin acknowledged the leak, tongue firmly in cheek.

Justice said the photos of her were fake.

Olympic gymnast Maroney also denied that the posted pictures were of her.

Apple has not yet commented on whether the photos were gathered through a weakness in its iCloud security, and to what extent it is investigating the leak. If caught, the person of people who posted the photos will likely be face jail time. Christopher Chaney, who posted personal photos of Scarlett Johansson and Mila Kunis online, was sentenced in 2012 to 10 years in prison after a year-long investigation.

Lena Dunham took to Twitter to urge people not to seek out the pictures online:

Perez Hilton, who had originally reposted the pictures on his site, explained his decision to remove them.

UPDATE: On Monday night, Kirsten Dunst posted a tongue-in-cheek Twitter update, essentially acknowledging that the stolen photos were hers.

This story is developing and will be updated as more information surfaces.