Heather posted a pic of her growing baby bump and wrote on Instagram, "😍😍😘 #thegrowinghubbells."
The news comes just months after Heather and Taylor's wedding, which took place in May.
The two, who have been sweethearts since high school, are also parents to son Elijah, who was born in September 2013.
In other news, Heather will begin filming horror short "The Cleansing Hour," which centers on a webcast that streams exorcisms live, starting November. The project is currently raising money with the help of Kickstarter.