Discussing the moment she decided to seek help, she recalled: "I looked at my doctor, and my eyes welled up because I was so tired of being in pain."
Chrissy revealed that she has been taking antidepressants for little over a month.
She is also planning on seeing a therapist - as she quipped that she should have started seeing one before welcoming Luna.
Explaining why she decided to open up about her battle, she revealed that she wanted it known that postpartum depression can affect anyone and it is not an illness to be ashamed of.
Later in the day she took to Instagram to share her essay with fans, telling them: "I'll just say it: I have post partum depression. So much love to @glamourmag for letting me share something that was eating me up inside for months and months."
While Chrissy is an avid user of social media, she explained that she did not feel the forum was the correct space to first share her diagnosis.
On Twitter, she responded the the outpouring of support she had received, insisting:
"Important note: please don't feel like you have to tiptoe around me! It is the most uncomfortable feeling ahhhh only downside to sharing PPD."
And she joked: "All of a sudden everyone's 'how are you!' turns to 'how arrrrrre you??????' know what I'm saying? No? Yes? Ah."
Postpartum depression - also known as postnatal depression - is a type of depression that many parents experience after having a baby.
It's a common problem, affecting more than 1 in every 10 women within a year of giving birth. It can also affect fathers and partners, although this is less common.
Many women do not realise they have post-natal depression because it can develop gradually - and Chrissy admitted she did not realise she had the illness as she thought it was only associated with wanting to harm your child.
Chrissy and John welcomed little Luna in April, and John recently revealed they will continue IVF treatment in the hopes of expanding their brood to "three of four".
The couple had a rough road to parenthood, having struggled with infertility for several years eventually turning IVF to conceive.
Commendably open about their struggles, John admitted their doctor was never able to give them an answer as to why it "didn't work out naturally", adding that they "did what they had to do".
Chrissy and John welcomed little Luna in April, and John recently revealed they will continue IVF treatment in the hopes of expanding their brood to "three or four".
The couple had a rough road to parenthood, having struggled with infertility for several years eventually turning IVF to conceive.
Commendably open about their struggles, John admitted their doctor was never able to give them an answer why it "didn't work out naturally", adding that they "did what they had to do".
She told People magazine that she hand-picked a female embryo during in vitro fertilization in order to ensure that she and her husband would have a daughter.
'I've made this decision...Not only am I having a girl, I picked the girl from her little embryo.
I picked her and was like, "Let's put in the girl,"' she explained of her thought process.
Within hours of the announcement Twitter was aflame with criticism for the model, but she was quick to defend herself as she tweeted 'my natural blessing from god was infertility' and admitted she wishes she had frozen more eggs long ago.
One fan wrote on Twitter: "I do think it's sad people would pick a specific gender / prefer a specific gender."
But Chrissy responded: "what is that (sic) difference though? i've already created embryos with a doctor. only after must it be random?"
She added: "What year is this!? And for the record, I am always happy and open to speak on infertility. The more casual, the better! I don't mind."
Symptoms of PPD
• A persistent feeling of sadness and low mood
• Lack of enjoyment and loss of interest in the wider world
• Lack of energy and feeling tired all the time
• Trouble sleeping at night and feeling sleepy during the day
• Difficulty bonding with your baby
• Withdrawing from contact with other people
• Problems concentrating and making decisions
• Frightening thoughts - for example, about hurting your baby
- Source: NHS Choices
Where to get help:
• Lifeline: 0800 543 354 (available 24/7)
• Suicide Crisis Helpline: 0508 828 865 (0508 TAUTOKO) (available 24/7)
• Youth services: (06) 3555 906
• Youthline: 0800 376 633
• Kidsline: 0800 543 754 (available 24/7)
• Whatsup: 0800 942 8787 (1pm to 11pm)
• The Word
• Depression helpline: 0800 111 757 (available 24/7)
• Rainbow Youth: (09) 376 4155
• CASPER Suicide Prevention
If it is an emergency and you feel like you or someone else is at risk, call 111.
