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)

A man paddleboards during a sunrise on the beach in Miami Beach, Florida, on March 23, 2021. (Photo by Chandan Khanna/AFP Photo)

Students from Cambridge University in England make their way home along Trinity Lane after celebrating the end of the academic year at a May Ball in Trinity College on June 18, 2019. (Photo by Joe Giddens/PA Images via Getty Images)

Alayah Pilgrim of Switzerland in action during the UEFA Women's EURO 2025 match between Switzerland and Norway at St. Jakob-Park in Basel, Switzerland, on July 2, 2025. (Photo by Stephane Mahe/Reuters)

American singer-songwriter Taylor Swift early October 2025 reveals “dark fear” that used to plague her before finding Travis Kelce as she opens up about wedding plans. (Photo by Mert Alas & Marcus Piggott)

Garrett Gerloff (L) of the USA GRT Yamaha WorldSBK Junior Team and Sandro Cortese (R) of Germany on OUTDO Kawasaki TPR colide during a warm up session of the the World Superbike Championship on Phillip Island, Victoria, Australia, 01 March 2020. (Photo by Scott Barbour/EPA/EFE)

Pawel Karpinski and Nadine Kinczel of Poland dance as they compete during IPC Wheelchair Dance Sport European Championships in Lomianki near Warsaw, November 9, 2014. (Photo by Kacper Pempel/Reuters)

Sherry Pie attends “RuPaul's Drag Race Season 12” meet the queens at TRL Studios on February 26, 2020 in New York City. (Photo by Astrid Stawiarz/Getty Images for VH1 “RuPaul's Drag Race”)