"The reason she kept it so private is because the heartbreak has been so intense with many false starts and failed attempts, that she didn’t want to say anything until the baby actually arrived," the source said. "She kept the secret from even her closest friends until yesterday, and reached out to a small circle right before she announced to the world."
And according to our source, Tyra isn't likely stopping at one child -- she definitely wants more.
The beauty entrepreneur has been open about her fertility struggles and "traumatic" experience undergoing IVF treatments in the past. Our source told us that Tyra's been trying for a year and a half to get pregnant.
"Implanted embryos weren't working for her to carry," the source said. "She has been harvesting eggs for the last 18 months to make this dream a reality."
York is the genetic son of Tyra and her boyfriend, Norwegian photographer Erik Asla, the source shared. While York is Tyra's first child, she's already been enjoying being a stepmother figure to Erik's two daughters for the past two years, our source added.
"She is great with kids and always wanted to be a mother," the source said.
Obviously, we have to admire Tyra's ability to maintain such a big secret! Tyra even played it cool over the weekend when she went to see Jennifer Lopez's "All I Have" show in Las Vegas, making no mention of her big baby news.
Instead, she Instagrammed a pic of herself and her mother trying on wigs on Sunday, writing, "When mother and daughter trade their hair..."