EXCLUSIVE: Matt Damon & Wife Expecting!
03/09/2008 AT 06:00 PM EDT
"They couldn't be happier," says Allen. "They're so excited!"
The current PEOPLE Sexiest Man Alive, 37, and his wife, 32, stepped out Sunday night at the Empire Film Awards in London – with Luciana glowing (and sporting a baby bump).
This is the third child for the family: Daughter Isabella was born in June 2006, and Luciana has a 9-year-old daughter, Alexia, from a previous marriage.
The actor is currently shooting the CIA thriller Green Zone in Morocco.