The singing and dancing actress, 26, gave birth to a baby boy on Saturday 28 September, according to Us Weekly.
The couple, who prefer to stay out of the limelight, named their baby Elijah.
Heather met longtime love Taylor in high school, and news broke of her expecting a baby back in April.
Due to her pregnancy, Heather will not return as Brittany S. Pierce for Glee's fifth season - the first without the late Cory Monteith.
She and her original castmates Amber Riley, Mark Salling and Harry Shum Jr. have changed from starring status to guest starring roles in the forthcoming series.
Congratulations Heather and Taylor!
Are you looking forward to the fifth season of Glee? Tell us what you think below!