Natasha Hamilton, now pregnant by boyfriend Ritchie Neville, struggled to cope when she became a mum aged 20.
She needed sleeping pills and even told her mum she wished she was dead, revealing that her post-natal depression had left her feeling suicidal.
And now, speaking with The Daily Star, the 31-year-old has revealed that she's terrified her fourth child could plunge her straight back into the 'baby blues'.
She said: "I know it could come back. A lot of people never shake off depression once they have had it.
“You can have it for a very long time and it can show itself at different times.
"I think it’ll be there forever."
Natasha, who is already mum to Josh, 11, Harry, 9, and Alfie, 3, was open and honest about her experiences, adding:
“There have been times along the way where I’ve just not felt myself."
“At first I’d think ‘What is this?’
"It’s taken me a long time to realise it’s something that’s been with me since high school.”
The Atomic Kitten star, who has said in interviews that she has a feeling her fourth child could be her first little girl, is now writing a book which she hopes will help other mums through post-natal depression.
She said: “It’s not easy going over what I’ve been through but sometimes you have to face your demons, otherwise you’ll never get rid of them.
“It’s worth talking about it because there are people out there going through the same thing.
"I’ve tried different things and there are many ways to overcome depression – it doesn’t have to be medication"
“Hopefully people will connect with the book and it will help.”
She added: "I’ve tried different things and there are many ways to overcome depression – it doesn’t have to be medication.
“When it happened to me there wasn’t much help.
"And even now people don’t always know where to go for help. Pregnant women might look glowing but on the inside they can be suffering."
We hope that Natasha's fourth pregnancy goes smoothly and that her wise words on post-natal depression will help many other mums going through the same thing.