Claire Coffee and Chris Thile Claire Coffee and Chris Thile

Grimm star Claire Coffee welcomed a son with husband Chris Thile on Friday.

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"GRIMM Season Finale! @christhile & I had a baby!" Coffee posted to Instagram on the momentous day. "I DON'T KNOW WHAT'S MORE INTENSE!! JK, it's definitely childbirth, but watch tonight anyway! #buryingthelead."

Coffee's pregnancy was written into the fourth season of Grimm, which wrapped up on Friday.

Coffee, 35, and Thile, 34, married in 2013. This is the first child for both.

VIDEO: See what's on Claire Coffee's Watchlist now!