"I was 218 pounds the day I gave birth to Rumi and Sir. I was swollen from toxemia and had been on bed rest for over a month," she wrote in a personal essay in the new September issue of Vogue. "My health and my babies' health were in danger, so I had an emergency C-section. We spent many weeks in the NICU."
Fortunately, husband Jay Z, 48, was "a soldier" for her during the terrifying time.
"My husband was a soldier and such a strong support system for me," she gushed. "I am proud to have been a witness to his strength and evolution as a man, a best friend, and a father. I was in survival mode and did not grasp it all until months later."
After the scary 2017 birth, the superstar, 36, says she's not as thin as she once was, and even has a "FUPA," or belly.
"I have a little mommy pouch, and I'm in no rush to get rid of it. I think it's real," she admitted. "Whenever I'm ready to get a six-pack, I will go into beast zone and work my ass off until I have it. But right now, my little FUPA and I feel like we are meant to be."
In her deeply personal story, she confessed to having "mistrust" in a "broken" romantic relationship — but was able to "resolve those conflicts."
- 'He Believes He Deserves Better': Lionel Richie Privately Fuming Over Diana Ross Blowing Him Off
- Doctors Can Tell: 27 Celebrity Nose Jobs Before and After — From Meghan Markle to Ariana Grande
- Lil Wayne Suffers Embarrassing Mic Issues During Opening For Beyoncé Days After Storming Out of 50 Cent Show
After years of speculation, Jay Z finally confirmed he cheated on Beyonce, but worked through the infidelities.
I have a beautiful wife who was understanding and who knew I'm not the worst of what I've done," he told David Letterman earlier this year.
We pay for juicy info! Do you have a story for RadarOnline.com? Email us at firstname.lastname@example.org, or call us at (866) ON-RADAR (667-2327) any time, day or night.
Get the exclusive celebrity scoop on all the stars you love before any of your friends by subscribing to our new podcast Straight Shuter below!