Amanda Peet Expecting Her Second Child

By Missy Ritti and Sarah Michaud

Thursday December 10, 2009 02:25 PM EST

Amanda Peet

Anita Bugge/WireImag

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There is much to be thankful for this holiday season for Amanda Peet and her husband of three years, writer David Benioff.

A rep for the 2012 actress confirms to PEOPLE that she's pregnant with the couple's second child. Further information, including a due date, was not provided.

Baby-on-the-way will join 2½-year-old big sister Frances "Frankie" Pen, born in February 2007.

So, will there be any more additions to the family after this? Not if Peet can help it.

"I think we want more," the actress, 37, told PEOPLE shortly after Frankie's birth. Benioff, she says, "wants three, but I’m old, I’m an old lady. Two is enough."

• Reporting by JULIE JORDAN