Sarah Harding of British girl group Girls Aloud has died at 39 of breast cancer.

The singer’s mother, Marie, confirmed the sad news on her daughter’s Instagram account on Sunday.

She slipped away peacefully this morning.

Sarah Harding attends The F&F AW15 show at The Savoy Hotel on April 21, 2015 in London, England.

Sarah Harding.Danny Martindale/WireImage

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.

Harding first announced she had been diagnosed with breast cancerlast August in an Instagram post.

The group, which disbanded in 2013, consisted of Harding,one-timeX-FactorU.S.

judge Cheryl, Nadine Coyle, Nicola Roberts, and Kimberley Walsh.

They amassed four singles that reached No.

1 on the UK charts, and 21 that hit the top 10.

There was a huge outpouring of grief across the U.K. entertainment community following the news of Harding’s death.

Spice GirlGeri Halliwell tweeted, “Rest in peace, Sarah Harding.

You’ll be remembered for the light and joy you brought to the world.

None of all that amazing music would have been the same without her spark.”

Natalie Appleton of girl group All Saints also sent condolences to Harding’s mother.