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)

American socialite Kylie and American model Kendall Jenner in the last decade of October 2023 joined forces as Sugar and Spice from Batman Forever. (Photo by Greg Swales)

American model Isabella Khair Hadid is seen on March 13, 2018 in Los Angeles, California. (Photo by The Mega Agency)

Cardi B arrives at the MTV Video Music Awards at Radio City Music Hall on Monday, August 20, 2018, in New York. (Photo by Carlo Allegri/Reuters)

English singer and songwriter Anne-Marie performs on stage during day two of Capital's Jingle Bell Ball with Seat at London's O2 Arena on December 8, 2019. (Photo by Isabel Infantes/PA Images via Getty Images)

American model Bella Hadid celebrating her 23rd birthday at L’Avenue at Saks Fifth Avenue New York, NY on October 10, 2019. (Photo by David Warren/Sipa USA)

A guest’s hands at the Essence Black Women in Hollywood awards luncheon at the Beverly Wilshire Four Seasons hotel in Beverly Hills, California on March 24, 2022. (Photo by Image Press Agency/NurPhoto/Rex Features/Shutterstock)

Euphoria star Sydney Sweeney in the last decade of March 2023 showcased her jaw-dropping curves in a sеxy new bikini shoot. The American actress, 25, pulled off a sultry stare perfectly as she modelled a black two-piece from Frankies Bikinis. (Photo by @frankiesbikinis/Instagram)