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)

Supporters and opponents of Russian opposition activist and anti-corruption crusader Alexei Navalny clash during unsanctioned protest in Manezhnaya Square in Moscow, Russia, Tuesday, December 30, 2014. The unsanctioned protest came hours after Alexei Navalny was found guilty of fraud and given a suspended sentence. Navalny, who has been under house arrest since February, is accused of breaking the terms of his house arrest to attend the rally and was detained by police as he approached the site of the protest. (Photo by Ivan Sekretarev/AP Photo)

American actress Kathryn Newton during the Chloe Ready to Wear Fall/Winter 2024-2025 fashion show as part of the Paris Fashion Week on February 29, 2024 in Paris, France. (Photo by Victor VIRGILE/Gamma-Rapho via Getty Images)

American vedette, burlesque dancer, model, and businesswoman Dita Von Teese performs during the Alexis Mabille Haute Couture Fall/Winter 2024-2025 show as part of Paris Fashion Week on June 25, 2024 in Paris, France. (Photo by Francois Durand/Getty Images)

Participants bathe in ice-cold water during a ceremony at Teppozu Inari Shrine in Tokyo, Japan, 12 January 2025. 80 men and women took part in the ice water endurance ceremony to purify their souls and pray for good health in the new year. (Photo by Franck Robichon/EPA/EFE)

Supporters of opposition member Venancio Mondlane protest during the inauguration of the ruling Frelimo party's leader Daniel Chapo as Mozambique's newly elected President in Maputo, Mozambique on January 15, 2025. (Photo by Reuters/Stringer)

Indian Border Security Force (BSF) soldiers offer sweet to each other during the celebrations to mark country's Republic Day at the India-Pakistan Wagah border post, about 35kms from Amritsar on January 26, 2025. (Photo by Narinder Nanu/AFP Photo)

Kyle Walker of AC Milan sprays water from his mouth prior to the start of the second half of the Coppa Italia match at Giuseppe Meazza, Milan on February 5, 2025. (Photo by Jonathan Moscrop/Sportimage/Alamy Live News)