Peter Sarsgaard and Maggie Gyllenhaal
Vittorio Zunino Celotto/Getty
11/28/2011 at 12:00 PM EST
and Peter Sarsgaard are expanding their family.
The actors are expecting their second child together, her rep confirms to PEOPLE.
star and Green Lantern
's Sarsgaard, 40, wed in 2009
and are already parents to 5-year-old daughter
"I just didn't have a clue," Gyllenhaal, 34, has said
"There's no way to prepare for the challenges, the immense joys, the surprises, the disappointments and the shocks," she said. "Your heart just rips open. It's amazing."
Reporting by JULIE JORDAN