"10:55 pm last night. Our royal baby was born," she wrote alongside a sweet photo cradling her newborn in the hospital while Fischer gives her a kiss on the head.
The Met Gala took place on Monday, and to celebrate Schumer jokingly shared a photo of her "Met look this year," which was her on the way to the hospital the night before.
The comedian announced that she was pregnant in October, and kept her fans updated on her tough pregnancy. In November, she canceled many shows after finding out she was suffering from hyperemesis gravidarum, or extreme morning sickness.
“I have not had an easy pregnancy," Schumer said, sharing how she was diagnosed. "It's extreme nausea and vomiting. If you've ever had food poisoning, it's that. I've had that every day for five months. It's been really awful...I throw up an Exorcist amount every day."
Schumer, however, had maintained a good spirit and couldn't be happier to have her baby boy in her arms.