Baby bliss! Jenna Dewan and fiancé Steve Kazee have welcomed their first child together, the actress revealed on Tuesday.

In an Instagram post, the 39-year-old shared with her social media followers that she gave birth to a son, Callum, last Friday.

"And just like that, our hearts exploded into all of eternity and beyond ❤️🌈❤️Welcome to the world you little angel! ❤️Callum Michael Rebel Kazee 3/6/20," she captioned a photograph of herself holding her bundle of joy.

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Kazee, 44, also took to Instagram to share the exciting news.

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"In an instant our universe burst wide open and nothing would ever be the same. Welcome to earth star child," he wrote along with a photo of him holding his baby boy's hand.

In September, Dewan and Kazee revealed that they were expecting their first child together — more than a year after Dewan's split from ex-husband Channing Tatum.

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“We are beyond overjoyed and couldn’t be happier to be expanding our family!” the couple told People in a statement.

The "Step Up" star and Kazee were first publicly linked in October 2018, not long before she officially filed for divorce from Tatum, 39.

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The pair announced their engagement in February.