Domino shared the news that the pair welcomed a baby boy in August by posting a photo of a painting of a placenta on Instagram, captioning it: "His heart shaped home #40dayspostpartum #placentaart."
She announced that the couple were expecting a baby back in February when she posted a photo of her baby bump on Instagram, explaining that they had suffered two miscarriages before this pregnancy.
"On the road again... pregnancy after loss is a whole other thing. After two miscarriages in a row we were ready to call it. I stopped trusting my body and started to accept the fact that I was done," she said.
"When I was pregnant at 25, I knew nothing," she added. "I had no community. I dove in blissfully unaware about birth and its mysteries.
"Now, with 10 years' worth of experience to pull from, I treasure my birth community and the knowledge I have. You're already teaching us how to stay in the day in a way we've never had to, little one. Thank you."
Domino, who also has a 12-year-old son named Cassius with a former partner, has also shared a photo of herself sleeping next to the baby boy on her Instagram Stories.
A post shared by Domino Kirke-Badgley (@domino_kirke) on Sep 20, 2020 at 2:35pm PDT
The couple have not shared any further details about the baby, including his name.
Penn and his Gossip Girl co-star Chace Crawford recently revealed that they struggle to watch themselves in old episodes of the drama.
Penn, who played aspiring writer Dan Humphrey, and Chace, who played socialite Nate Archibald, admitted to each other that they can't bring themselves to look back on their younger selves in the show.
"It has nothing to do with the show, but it was very hard to watch," Penn said. "These snapshots of yourself when you're 20, 21, 22 years old. Who can enjoy that? Sometimes it's just uncomfortable."
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