shared behind the scenes snaps from filming drama Trespasses after the show's nominations at the BAFTAs.
The actress, 57, congratulated the cast and crew for receiving six TV nominations at this year's awards.
The series involves a love story set against the backdrop of the Troubles, with Gillian as Gina - a woman at war with her daughter Cushla (Lola Petticrew), whose desires and dreams have been frustrated by the grind of daily life.
Taking to Instagram on Tuesday, Gillian shared a stunning snap of herself posing alongside actress Lola during filming.
Another photo saw star posing playfully in pink hair rollers as she got her hair and makeup done.
She also shared several close up selfies and a snap of Lola behind the wheel of a car.
Gillian Anderson looked glamorous as ever as she shared behind the scenes snaps from filming Channel 4 drama Trespasses (pictured with Lola Pettigrew)
Another photo saw The Crown star posing playfully in pink hair rollers as she got her hair and makeup done
Alongside the post, Gillian wrote: 'Congratulations to the whole cast and crew of Trespasses for their 6 @bafta TV nominations!!
'This is such a special show with a wonderful cast and crew and I fell a little bit in love with Gina along the way. I’m so very proud to have been a part of this team.'
Trespasses was nominated for Limited Drama, Costume Design, Dawn Shadforth for Directing, Photography and Lighting, Production Design and screenwriter Ailbhe Keogan was nominated for Writing.
Trespasses is based on Louise Kennedy’s breakout debut novel, which was shortlisted for the Women’s Prize in 2023 and has been adapted for the screen by Bad Sisters writer Ailbhe Keogan in her first lead writing credit.
The series takes viewers back to 1975 in a town outside Belfast.
While working one night behind the bar of her family pub, serving a motley crowd including locally-stationed soldiers, Catholic schoolteacher Cushla meets Michael, an older Protestant married man.
Michael often defends IRA suspects and is friends with cultured Bohemians who enrage and intrigue Cushla.
Worlds apart, Cushla knows a relationship like this spells all kinds of trouble, but they are irresistibly drawn to one another.
The actress looked radiant in one photo as she posed in full hair and makeup
Another snap saw her wrapped in a purple dressing gown while in the bathroom
She also shared several close up selfies and a snap of Lola behind the wheel of a car
Gillian also shared a photo of the shiow's scripts with 'Confidential' written across the front
Alongside the post, Gillian wrote: 'Congratulations to the whole cast and crew of Trespasses for their 6 @bafta TV nominations!!'
Trespasses was nominated for Limited Drama, Costume Design, Dawn Shadforth for Directing, Photography and Lighting, Production Design and screenwriter Ailbhe Keogan was nominated for Writing
Gillian is arguably best known for her role as Dana Scully in the 90s sci-fi series The X-Files.
She also took on the role of Blanche in 2014's theatre adaptation of A Streetcar Named Desire and played ex-BBC journalist Emily Maitlis in Scoop.
In 2017, she co-authored WE: A Manifesto for Women Everywhere, and in 2022, she launched the podcast What Do I Know?!, which explored sexual liberation.
She is also a best-selling author of Want: Sexual Fantasies by Anonymous.
Last year, Gillian was named a global ambassador for L'Oréal Paris, the world's largest beauty brand, and will front the new Age Perfect campaign.
The actresssaid in the campaign: 'They say your best years are behind you. I'm just getting started.'
'I wish that in those early years I would not have wasted so much time on my doubts. Age has never been a limit, it's an advantage. My advice for facing doubt is to say f*** you. I leap before I give myself a chance to be afraid.
'And then there was a certain point where I stopped caring so much. It's very easy for young women to feel less than what they see here.
The mother-of-three added: 'Sorority for me is about support, it's about seeing the similarities between us as women.
'We're not just strong, we're unstoppable. I can say it and own it and I believe it. I'm worth it.'
