Girls Aloud singer Sarah Harding has announced that she is receiving treatment for cancer.
The 38-year-old made the announcement in a post on social media, saying that she felt "now is the right time to share what's been going on".
She wrote: "Hi everyone, I hope you are all keeping safe and well during these uncertain times."
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"Earlier this year I was diagnosed with breast cancer and a couple of weeks ago I received the devastating news that the cancer has advanced to other parts of my body," she continued.
"I'm currently undergoing weekly chemotherapy sessions and I am fighting as hard as I possibly can.
"I understand this might be shocking to read on social media and that really isn't my intention. But last week it was mentioned online that I had been seen in hospital, so I feel now is the time to let people know what's going on and this is the best way I can think of to do so."
She paid tribute to her "amazing mum, family and close friends" and to the staff of Britain's NHS.
"I am doing my very best to keep positive and will keep you updated here with how I'm getting on," she concluded.
"In the meantime I hope you'll all understand and respect my request for privacy during this difficult time. Sending you all so much love….xx."
Harding shot to fame in 2002 as a contestant on Popstars: The Rivals on which she won a place in Girls Aloud alongside Cheryl Tweedy, Kimberly Walsh, Nicola Roberts and Nadine Coyle.
Their biggest singles include Sound of the Underground, The Promise and Love Machine.
After the band split in 2013, Harding released her own solo album.
Harding also found success as an actress, appearing in the St Trinian's film franchise and ITV soap Coronation Street.
She won Celebrity Big Brother in 2017, and was the last female winner of the show, which was axed the following year.
Showing support for her former bandmate, Nadine Coyle wrote on Instagram: "I love you!!! You have always been able to achieve miracles when needed!! I am here for all the way & always will be!!" While Cheryl Tweedy tweeted a broken heart emoji.
Steps star Ian H Watkins also commented on her Instagram post, writing: "Sending huge" followed by three red-heart emojis, adding "Stay strong xx We're all behind you xx".
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