Urging other mums in a similar crisis to seek help, Adele described Laura’s story as “intimate and heartbreaking”.
Adele, 30, said alongside a picture of the pair together: “This is my best friend.
“We have been friends for more of our lives than we haven’t.
“She had my beautiful godson six months ago and it was the biggest challenge of her life in more ways than one.
“She has written the most intimate, witty, heartbreaking and articulate piece about her experience of becoming a new mum and being diagnosed with postpartum psychosis.
“Mamas, talk about how you’re feeling because in some cases it could save yours or someone else’s life.”
Writing for a parenting blog, Laura talks about a “horrific” labour which her doctor believes might have triggered the illness.
After coming home with her son, Laura describes the feeling of having fallen out of love with her life. She tells how her skin went pale, she could barely eat or drink and started suffering severe anxiety attacks.
As things got worse, Laura even accused her partner Hugo of kidnapping their baby.
Laura, for whom Adele wrote the song My Same on her album 19, was eventually admitted to hospital and spent two weeks away from her son.
She struggled to recognise her- self and says “suicidal thoughts” became normalised.
But she now describes herself as recovering and “happy confident and strong” after receiving support from family, friends and a psychiatrist, plus medication and psychotherapy.
Postpartum psychosis is “a particularly serious form of mental illness”, said Vivien Watefield of the charity Home Start.
She added: “Anyone in the public eye brave enough to talk about this helps mums to realise that they are not alone.”