Model Emily Ratajkowski attends Vogue Party as part of the Paris Fashion Week Womenswear Spring/Summer 2018 at on October 1, 2017 in Paris, France. (Photo by Marc Piasecki/Getty Images)

Australian model Shanina Shaik arrives to attend the Givenchy Menswear Spring/Summer 2023 show as part of Paris Fashion Week, in Paris, on June 22, 2022. (Photo by AFP Photo/Stringer)

American model Hailey Bieber attends the Saint Laurent Womenswear Spring/Summer 2023 show as part of Paris Fashion Week on September 27, 2022 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)

British model Jourdan Dunn attends the Victoria Beckham Womenswear Fall Winter 2023-2024 show as part of Paris Fashion Week on March 03, 2023 in Paris, France. (Photo by Vittorio Zunino Celotto/Getty Images)

American model and actress Kate Upton walks the runway during Vogue World: Paris at Place Vendome on June 23, 2024 in Paris, France. (Photo by Victor Boyko/Getty Images for Vogue)

British Alex Yee looks exhausted after the men's individual triathlon race at the Paris 2024 Olympic Games, on Wednesday 31 July 2024 in Paris, France. (Photo by Tom Jenkins/The Guardian)

A dog looks on, as dogs and humans take part in the annual Paris Sausage Walk, also known as the march of the dachshunds, in Paris, France, on November 17, 2024. (Photo by Kevin Coombs/Reuters)

The photo project was done for the organization Fishlove and included some other U.K.-based celebrities posing in the buff with critters ranging from bass fish to sharks. Its goal is to raise awareness of how overfishing is destroying the oceans. The release of Gillian's nearly nude pic, which was snapped by French portrait photographer Denis Rouvre, is timed with a European Parliament vote on banning destructive forms of deep-sea fishing in the Northeast Atlantic. The Fishlove organization is trying to rally voters to sign a petition ending deep-sea trawling – which, according to scientists, is negatively impacting the fish population and their habits – and Gillian solicited signatures in a Twitter post. Photo: “Fish Love” Project by Photographer Denis Rouvre. Gillian Anderson. (Photo by Denis Rouvre)