"Ok I can't keep it a secret anymore-I've been working on a very special new project for 2014-A BABY! Josh and I are expecting! I'm so happy!" Lee wrote Saturday.
Garbage singer Shirley Manson sent a tweet of support to the mother-to-be. "Congratulations lil momma in waiting. So happy for you! Lots of showbiz kisses into the air! But really...that's so cool," Manson tweeted.
Lee and Hartzler, a therapist, got engaged in early 2007 and married that May.