More than 50 topless photos of actress Amber Heard were leaked on 4chan and Reddit on Sunday, TMZ reported. Nude photos of Gabrielle Union, Kim Kardashian, Vanessa Hudgens, Hayden Panettiere, and Rihanna also surfaced online over the weekend.

According to TMZ, among the images leaked online was a topless photo of Heard with a message for her fiancé Johnny Depp. Heard reportedly referred to Depp as “beloved Tonto man” -- the character he played in the 2013 movie remake of “The Lone Ranger” -- in the message. The Sydney Morning Herald reported that the leaked photos also included shots of Heard and Depp performing a “sexy bedroom scene” for the 2011 film “The Rum Diary.”

The images of the 28-year-old were reportedly leaked a day after nude pictures of reality star Kardashian and other stars surfaced online. According to TMZ, Heard's representatives of have not responded to the leak.

The latest hack comes nearly a month after nude photos of several celebrities were leaked on the Internet, including those of “The Hunger Games” actress Jennifer Lawrence, Nickelodeon star Victoria Justice, model Kate Upton and many others.

Since the first leak, 4chan, an image-sharing website, has revised its copyright policy to facilitate the quick removal of images that violate its rules, while Reddit has banned “The Fappening,” a subreddit created by a user for the pictures and news relating to the leaked images, from its website.

The FBI also opened an investigation into the first incident, to identify those responsible behind the massive hack, but no suspects have been named so far.

While some of the stars confirmed that the leaked photos were real, others claimed that the images were not authentic. Actresses Meagan Good and Union have confirmed the authenticity of their leaked photos and released statements regarding the scandal.