Nick Cannon is ''proud'' of his ex-wife Mariah Carey for speaking publicly about her bipolar disorder diagnoses.

The 37-year-old rapper was married to the 'We Belong Together' hitmaker - with whom he has six-year-old twins Moroccan and Monroe - from 2008 to their divorce in 2016, and after Mariah recently revealed she was diagnosed with bipolar in 2001, sources have said Nick is behind her all the way.

An insider told 'Entertainment Tonight': ''Nick has known about Mariah's diagnosis forever. This isn't news to him. This was a big part of their relationship and even today, it's something he's mindful of.

''He's proud of her for coming forward and using her platform for good. He loves her as the mother of his children and always wants what is best for her.''

Mariah revealed her secret 17-year-long battle with bipolar II - in which a person experiences hypomanic episodes as well as low, depressive ones - during an interview published this week.

She said: ''I didn't want to believe it. I was so terrified of losing everything I convinced myself the only way to deal with this was to not deal with this. Until recently I lived in denial and isolation and in constant fear someone would expose me. It was too heavy a burden to carry and I simply couldn't do that anymore. I sought and received treatment, I put positive people around me and I got back to doing what I love - writing songs and making music.''

The 'Touch My Body' hitmaker now undergoes therapy and is on medication for the illness, and has said that 17 years on from her diagnoses, she is now ready to speak out in the hopes that other suffers can realise they're not alone.

She said: ''I'm just in a really good place right now, where I'm comfortable discussing my struggles with bipolar II disorder. I'm hopeful we can get to a place where the stigma is lifted from people going through anything alone. It can be incredibly isolating.''