Teigen described her experience with the mind-altering anesthetic, which the FDA approved for treatment-resistant depression.
The model got a do-over during her vow renewal on the couple's 10th anniversary.
The topless selfie comes just a month after the TV personality documented her first colonoscopy on Instagram.
The cookbook author revealed the unique installation alongside her husband, John Legend, in a video for Architectural Digest.
Son Wren's birth comes just five months after the arrival of their daughter Esti in January.
"Good lord this should be a scripted show," Katie Couric commented on Teigen's wild tale.
The star had to respond to one totally absurd accusation on her Instagram comment section.
"She can just shut up," Legend said after Kelly criticized Teigen over her dress at the White House Correspondents' Association dinner last weekend.
It all started when the "Cravings" cookbook author posted a photo of her husband and their baby daughter on Instagram.
The singer and wife, Chrissy Teigen, share three kids: son Miles, daughter Luna and their newest addition, daughter Esti Maxine.