Credit: Jim Spellman/

Why didn't Amanda Peet appear on the Late Show With David Letterman Tuesday to promote her new indie Please Give?

She just gave birth!

The actress, 38, and her husband, screenwriter David Benioff, welcomed their second child, Molly June Benioff, in NYC Monday, her rep tells

The two, who wed in 2006, have a daughter Frances, 3.