The Glee alum shared the happy news on Twitter with an adorable photo showing off her small, growing baby bump. Heather tagged the photo, "#thegrowinghubbells."
The couple, who welcomed their son Elijah in September 2013, tied the knot in May in a gorgeous outdoor ceremony at Old Canyon Ranch in Topanga, California.
Heather's on-screen Glee wife Naya Rivera -- who recently celebrated her own baby shower -- quickly responded to the news, tweeting, "SO exciting! Congrats @HeatherMorrisTV."
In March, Heather had an opportunity to share her excitement for Naya's pregnancy news, telling ET, "I'm just excited because now my baby [will have] a friend."
For a look at some other celebrity baby bumps to keep an eye on this summer, check out the video below.