Gillian Anderson recently celebrated her 58th birthday in London, sharing a makeup-free selfie while wearing a festive purple party hat. The two-time Emmy winner, who has 6.1 million social media followers, thanked fans for their birthday messages.

Anderson is currently engaged in rehearsals for a West End production of Edward Albee's 1962 play "Who's Afraid of Virginia Woolf?" She is set to portray Martha, opposite Billy Crudup's George, in the revival directed by Marianne Elliott, which is scheduled to run from September 21 through December 19 at the @sohoplace theater.

Following her birthday post, numerous Instagram users expressed astonishment at Anderson's seemingly unchanged appearance. Comments included "I wanna age like this bro, WTF!," "Aged like good wine, OMFG!," and "45 again, how do you do it!" Another user wrote, "HOW DOES SHE STILL LOOK THE SAME?"

Anderson also reposted birthday tributes from fellow actors, including Kerry Washington, her co-star from "The Last King of Scotland," and Hannah Einbinder, from "Teenage Sex and Death at Camp Miasma." Einbinder, Sarah Sherman, Kevin McDonald, and Dylan Baker also star in "Teenage Sex and Death at Camp Miasma," which premiered in UK theaters on August 21. The film reportedly earned $251,500 on its opening weekend against a $10 million budget.

Other upcoming projects for Anderson include a role in Jane Schoenbrun's "The Turning Door," a crime thriller titled "Animals" for Netflix directed by Ben Affleck, and a seventies-set miniseries called "The Boys from Brazil" for Netflix, created by Peter Morgan. She also has a role in Chris Roberts' video game "Squadron 42."

Anderson reprised her iconic role as FBI Special Agent Dana Scully on July 21 for a commercial promoting The LEGO Ideas "The X-Files" set. Reflecting on her portrayal of Scully in an interview with the LA Times, Anderson noted a distinction between herself and the character, stating, "The strange thing is I don't identify with Scully in the same way I do with other characters that I played for much less time." She attributed this to Scully's reserved nature, contrasting it with her own "intrinsically rebellious nature."

Anderson portrayed the skeptical Catholic for 11 seasons of Chris Carter's Fox drama (1993-2002 and 2016-2018) followed by films The X-Files (1998) and The X-Files: I Want to Believe (2008)

Anderson gained recognition for her role as Dana Scully in "The X-Files," which aired for 11 seasons from 1993 to 2002 and again in 2016 to 2018, alongside the films "The X-Files" (1998) and "The X-Files: I Want to Believe" (2008). A Hulu reboot of "The X-Files" is reportedly in production, starring Danielle Deadwyler.

Born in Chicago, Anderson has resided in London since 2002, having lived there from the ages of two to 11. She has three children: daughter Piper Maru Anderson-Klotz, and sons Oscar and Felix, from previous relationships.