Johnny Depp's fiancee Amber Heard latest victim of hacked explicit celebrity photos

Superstar Johnny Depp's fiancee Amber Heard has become the latest victim of the ongoing Hollywood hacking scandal after more than 50 topless photos and videos of the actress surfaced online.

The pilfered videos show the 28-year-old blond Texan, whose mother is an Internet researcher, participating in an apparent threesome and smoking what looks like a bong, reported the New York News Daily.

In one topless photo, Heard holds a sign reading 'Tonto', apparently referring Depp, 51, who played the character in The Lone Ranger last year. The pictures also include shots of Heard and Depp performing an intimate bedroom scene in the 2011 film The Rum Diary.

The images were leaked a day after mysterious hackers dropped racy pictures of reality star Kim Kardashian and actress Vanessa Hudgens online.

The massive hacking scandal began over Labour Day weekend, when dozens of photos of Oscar-winning actress Jennifer Lawrence in the nude - and 100 other celebs in compromising positions - were stolen from private accounts and put on the Internet.

The FBI has launched an investigation, but no suspects have been named.