Girls Aloud singer Sarah Harding died early Sunday morning after she lost the battle with breast cancer. She was 39 years old.

The singer’s mom, Marie, revealed the tragic news on Instagram via the late star’s account.

“It’s with deep heartbreak that today I’m sharing the news that my beautiful daughter Sarah has sadly passed away. Many of you will know of Sarah’s battle with cancer and that she fought so strongly from her diagnosis until her last day. She slipped away peacefully this morning,” it read.

“I’d like to thank everyone for their kind support over the past year. It meant the world to Sarah and it gave her great strength and comfort to know she was loved. I know she won’t want to be remembered for her fight against this terrible disease – she was a bright shining star and I hope that’s how she can be remembered instead.”

Just four months before Harding had released a memoir titled Hear Me Out. She had written in the book that one symptom of her breast cancer she dismissed was pain.

“At first I thought it was just a cyst. I’d been playing my guitar a lot, and I thought the strap had probably irritated an area around my breast,” Sarah Harding wrote, adding that as time passed, the pain got worse.

She continued, “It got so bad that I couldn’t sleep in a bed anymore. I slept on the sofa, popping painkillers like they were Smarties. I really overdid it, but the pain was overwhelming. Eventually, my skin started to bruise, and by now I was terrified.”

After the diagnosis, Harding moved in with her mother in Manchester upon undergoing treatment. Although she had not married, she was engaged to DJ Tom Crane in 2011.

Girls Aloud, the British group was conceived in 2002’s Popstars: The Rivals. The group which consisted of Cheryl Tweedy, Kimberley Walsh, Nadine Cole, Nicola Roberts, and Harding disbanded in 2013 just hours after their final performance at Echo Arena Liverpool.