The 26-year-old actress and her longtime beau have named their little bundle of joy Elijah, according to US Weekly.
The lovebirds have been together since high school, and while Heather and Taylor are yet to tie the knot, the new mother has made no secret of her wish to settle down.
"I want to marry Taylor so bad," said Heather, speaking to Fitness magazine. "That's what I really care about."
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"I want to have kids with him," she has previously said. "I love acting, but if it affects my relationship then I won't continue."
News of the Hollywood star's pregnancy first came to light in April.
"It was totally unexpected, but they are incredibly happy and excited," an insider told US Weekly.
With her hands full with baby Elijah, Heather will not star as her main character Brittany S. Pierce in the new season of Glee, but will still make guest appearances.