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By Kelcie Willis, Cox Media Group National Content Desk

Chrissy Teigen is well-known for humorous tweets, joking about her musician husband, John Legend, 38, cooking on Snapchat and her love for her and Legend’s first child, Luna Simone, whom they welcomed last April.

Her struggle with postpartum depression and anxiety was not publicly known until now.

The 31-year-old model and cookbook author wrote an essay in Glamour magazine about her experience, which the Centers for Disease Control and Prevention says affects one in nine women with varying symptoms.

“I decided I’d talk about something no one really knows about me, mainly because I just learned about it myself,” Teigen said.

Teigen said she kept her struggle private because of the headlines that follow when she speaks about her life, particularly when it came to her comments during her pregnancy with Luna, 11 months, who was conceived by IVF.

“I hesitated to even talk about this, as everything becomes such a ‘thing.’ … I can already envision what will be said about me after this admission,” she wrote in Glamour. “But it’s such a major part of my life and so, so many other women’s lives. It would feel wrong to write anything else.”