Earlier this month (Mar17), the model opened up about her struggles following the birth of their daughter Luna in April (16), admitting she was unhappy, would often spontaneously cry, have mood swings and be so exhausted she couldn't even make it to bed. So she went to a doctor to find out what was wrong with her, and was subsequently diagnosed with the condition.
John has now spoken out to praise his wife for being so open about a subject which a lot of women still feel like they can't talk about.
"I'm so proud of her," he told E! News. "She showed me the drafts when she was writing it and I knew it would mean a lot to a lot of women for them to see that. By acknowledging the pain that she's going through, in doing that she also acknowledges the pain that a lot of women go through after they have a child.
"A lot of people don't want to talk about it. A lot of people feel alone when they're going through it and for her to let people know that they're not alone, I think was really powerful."
He added to People.com that it was also powerful because it showed people the condition can affect anybody, regardless of wealth and fame, and is still a struggle no matter how successful you are.
When asked what advice he would give to others in his shoes, John, 38, said partners need to be present, compassionate and understanding.
Writing in U.S. Glamour magazine, Chrissy revealed, "I looked at my doctor, and my eyes welled up because I was so tired of being in pain. Of sleeping on the couch. Of waking up throughout the night. Of throwing up. Of taking things out on the wrong people. Of not enjoying life. Of not seeing my friends. Of not having the energy to take my baby for a stroll."
She also admitted she still has good and bad days but the "really bad days" are gone.