Mary Stuart Masterson and Jeremy Davidson

Mary Stuart Masterson is pregnant with twins, E! Online reports.

"We are four months along," said Masterson's husband, Army Wives actor Jeremy Davison.

Mary Stuart Masterson welcomes a son

The couple, who have been married since 2006, already have a 17-month-old son.

"In five months we are going to have three kids under the age of 2. We are in happy shock about it," Davidson added. "Balancing career and family is becoming increasingly challenging for me."

Masterson, 44, who's guest-starred on Law & Order: Special Victims Unit, most recently appeared on NBC's now-defunct Mercy.