ABC news is reporting that the FBI said it is "aware" of the hacking and is "addressing the matter."
The nude photos were posted on an image sharing site called 4chan and have since been reposted on numbers other social media sites, including Twitter, which has removed photos as they appear.
The anonymous hackers claim they have personal photos of more than 100 celebrities.
Lawrence's camp is threatening legal action to any and all sites that post the photos of the Hunger Games actress.
— The Globe and Mail (@globeandmail) September 2, 2014
Lawrence Shire, Upton's attorney, has issued a similar statement.
"This is obviously an outrageous violation of our client, Kate Upton's, privacy," he said. "We intend to pursue anyone disseminating or duplicating these illegally obtained images to the fullest extent possible."
The FBI issued a statement about its investigation into the breach.
"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. Any further comment would be inappropriate at this time."
Although hackers claimed to have retrieved the photos from storage on the iCloud, those accusations have not been confirmed.
Apple released a statement saying it is looking into the allegations and seeking to reassure its users that systems will not be compromised in the future.
"We take user privacy very seriously and are actively investigating this report," the statement said.