It was only when she reached her thirties that she understood exactly what it was she was dealing with.
"For years, I'm in one of the top-selling female groups of all time suffering with depression," sh said.
"It got really really bad... I was suicidal," she said. "I was in that place where it got so dark and heavy because sometimes you feel like 'I'm the provider, I take care of people, I'm not supposed to be feeling this way - what do I do?' I wanted out."
She said that her experience had inspired her to speak out to "normalise this mental health discussion".
Williams is a growing number of artists speaking out about mental health.
For confidential help and support call Samaritans free on 116 123 in the UK or email firstname.lastname@example.org
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