The "Hills" alum took to Instagram on Monday to share some big news: Her third child with hubby Jay Cutler, a daughter named Saylor James Cutler, has arrived!
In addition to spilling the big baby news, Kristin shared a cute picture of a pink newborn onesie and her baby girl's birth certificate.
"Saylor James Cutler was born today at 132pm!!" she captioned the sweet snapshot.
According to the document, little Saylor weighed-in at 7lbs and 6oz and she's 19 1/4 inches long.
The reality TV star and the Chicago Bears quarterback are already the parents to sons Camden and Jaxon -- we're sure the boys are so excited to finally meet their baby sis!
The 28-year-old opened up about her sons' relationship while chatting with Us Weekly earlier this year.
"Camden is a really good big brother," Kristin revealed during an event back in May. "He's very protective and very sweet, But he also gets a little upset when Jax tries to take his toys and messes with his stuff. He gets a little territorial with some stuff, so it's kind of funny."
It'll be interesting to hear how little Saylor shakes things up -- and we can't wait to see the first photos of the couple's newest addition!
What do you think about Saylor's name? Tell toofab in the comment section below and check out the gallery above to see more unique celebrity baby names!