Congratulations to Annie and Stephen!

The clock is ticking down … to a new baby.

24 star Annie Wersching and her actor/comedian husband Stephen Full are expecting their first child, they tell PEOPLE exclusively.

The couple is “ecstatic,” says Wersching, who plays Renee Walker opposite Kiefer Sutherland on the show.

“Feeling great” during her pregnancy, Wersching, 32, notes that she’s “craving mint chocolate chip ice cream!”

The couple married at their Los Angeles home in September 2009.