Kristin Cavallari and Jay Cutler welcomed their third child and first daughter on Monday afternoon.
The former Laguna Beach star, took to Instagram to announce the arrival of their baby girl. She posted a picture of her newborn's footprints alongside a pink bow and a pink and white onesie.
"Saylor James Cutler was born today 132pm!!" Cavallari captioned the photo.
Back in July, the fashion designer revealed she was expecting a girl via her official app. The couple has two boys, Camden Jack and Jaxon Wyatt.
In addition to having a jewelry line and a shoe line, the mother of three is set to release her first book, "Balancing in Heels" in March 2016.
In interview with E! News, Cavallari said her book is an "intimate look at her life."
"It's going to be a lot of fashion and beauty. Because I'm such a big health nut, it's also going to be health and fitness. And then a lot of recipes because I love to cook and a lot of mommy and wife stuff," the proud mom said.
"So really just everything in my life...and I think it's just a great way for my fans to connect with me," she added.