updated 12/14/2010 AT 3:00 PM ET
•originally published 12/14/2010 AT 3:25 PM ET
Jennifer Connelly and Paul Bettany are expanding their family.
The actress, 40, is pregnant with her third child, her rep confirms to PEOPLE.
Connelly and The Tourist star Bettany, 39, are already parents to son Stellan, 7, as well as Kai, 13, from her previous relationship with David Dugan.
“Becoming a mother has made all the difference in terms of learning to take more responsibility for myself and my life,” she has said.