Lady Gaga will "never forget" shooting a scene on 'A Star Is Born' just hours after her friend passed away.

Lady Gaga and Bradley Cooper in Entertainment Weekly

Lady Gaga and Bradley Cooper in Entertainment Weekly

The 32-year-old singer-turned-actress' former assistant, Sonja Durham, lost her battle with cancer in May 2017 and though the 'Poker Face' hitmaker broke from shooting scenes as up-and-coming singer Ally in 'A Star Is Born' to try and be by her pal's side in her final moments, she returned afterwards for a really "special scene" and was thankful for the support of her co-star and director, Bradley Cooper.

Asked about a scene where her character sings a ballad at the Shrine Auditorium in Los Angeles, she told Entertainment Weekly magazine: "My very, very, very dear friend Sonja died of cancer that day.

"We were supposed to shoot in, like, 30 minutes, and I left the set because her husband called me and I could hear her in the background and I just got in the car and drove. I missed her by 15 minutes and she died.

"I literally laid with her, with her husband, and their dog, and his son...

"When I came back, Bradley was so gentle with me and we got through it. I performed the song. He was like, 'You don't have to do it again. It's OK.'

"All I ever wanted to do was sing. I'll never forget that day. It was really a special scene, and I'll always remember that moment."

Gaga claims making the movie has "changed" her, especially because of the "phenomenal" way 43-year-old Bradley worked.

She said: "It just has changed me. Watching Bradley work was phenomenal and then having him believe in me -- it gave me more ammunition to believe in myself and I just feel so blessed to have had that experience...

"I think what I learned from Bradley [is] it's OK to be relentlessly sure of your vision, and to go after it with every fiber of your being, and to never stop white gloving what you're making.

"Sometimes, as an artist, I second-guess myself when I go, 'Am I pulling the thread? Am I unravelling the whole blanket now? Do I need to stop?' It's changed the way that I work today."