Knapp, 21, delivered a baby girl named Kai on Friday, a source confirms to PEOPLE, adding that “mom’s doing great!”
A different source told PEOPLE in March, “Ryan is aware of the situation [and] totally prepared to take responsibility should the child be his.”
This child is the first for Knapp. Phillippe, 36, has two children, Ava, 11, and Deacon, 7, with ex-wife Reese Witherspoon.
– Blaine Zuckerman and Dahvi Shira