Gwyneth Paltrow, the Hollywood actress, has disclosed she suffered "the darkest and most painfully debilitating" time of her life when she had post-natal depression after the birth of her second child.
On her blog, she wrote that she had expected to experience a similar "euphoria" to that she had after giving birth to her first child, her daughter Apple, in May 2004.
Instead, she said she suffered five months of post-natal depression.
She wrote: "When my son, Moses, came into the world in 2006, I expected to have another period of euphoria following his birth, much the way I had when my daughter was born two years earlier.
"Instead I was confronted with one of the darkest and most painfully debilitating chapters of my life.
"For about five months I had, what I can see in hindsight as postnatal depression, and since that time, I have wanted to know more about it."
On her blog Goop, which includes recipes, dieting tips and lifestyle advice, she then added articles by gynaecologist Dr Laura Schiller on how to tackle post-natal depression.
Paltrow won an Oscar for her role in the film Shakespeare in Love and is married to the British musician Chris Martin, the singer of the group Coldplay.