The FBI and Apple are investigating the apparent hacking iCloud accounts that led to the publication of hundreds of alleged naked photos of female celebrities online.
Stars including actress Jennifer Lawrence have threatened to take legal action over the release of the photos.
Apple spokeswoman Nat Kerris said: "We take user privacy very seriously and are actively investigating this report."
The FBI said it was "aware of the allegations concerning computer intrusions and the unlawful release of material involving high profile individuals, and is addressing the matter".
Emma Watson has hit out at a popular "lack of empathy" towards the celebrity victims of a photo hacking scandal.
Celebrities including Hollywood actress Jennifer Lawrence have threatened to take legal action after naked snaps of them are hacked.