The 28-year-old former "Glee" star, who already has 11-month-old son Elijah with husband Tyler Hubbell broke the news on Instagram.
The "Ice Age: Continental Drift" actress showed off her little baby bump in the picture as she posed alongside a large blue ruler that read "The Growing Hubbells".
The actress did not reveal if she knows the gender of the unborn or not.
Among the first to congratulate the couple was Heather's former "Glee" co-star Naya Rivera, who is expecting her first child.
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