Connelly gave birth on May 31, her rep told Us Weekly, with the actress delivering the child in a scheduled home water birth in a birthing pool.
The couple -- who met while filming "A Beautiful Mind" in 2003 -- have a 7-year-old son, Stellan. Connelly also has a 13-year-old son, Kai, with her ex, photographer David Dugan.
"Everyone is healthy and doing well," Connelly's rep told the magazine. "The family is very excited."
And now that we're thinking about Jennifer Connelly: more movies, please, Jennifer Connelly! While it seems like we see your husband in every other movie we watch on Netflix, we do not feel like we see nearly enough of you these days.