The couple welcomed the tot on 30 December (15), but only broke the news to fans this week (begs04Jan16).

New dad Barlowe took to Instagram on Wednesday (06Jan16) to share a photo of their daughter wrapped up in a white blanket, and captioned the snap, "One week ago today this sweet Baby Girl came into the world and changed our lives forever!"

The baby's arrival capped off a great year for the pair - Barlowe was named the Society of European Stage Authors and Composers (SESAC)'s 2015 Songwriter of the Year, while Lindsey won two Country Music Association Awards in November (15) for penning Little Big Town's Girl Crush hit.

Lindsey's other writing credits include Carrie Underwood's Jesus, Take the Wheel and Two Black Cadillacs, while Barlowe was the man behind Dustin Lynch's Where It's At (Yep, Yep) and Lady Antebellum's American Honey.