Christmas just got a whole lot merrier!

A source tells ET that Gwen Stefani is working on a Christmas album, which is set to drop in the fall.

WATCH: EXCLUSIVE: Gwen Stefani Opens Up About 'Shocking' Duet With Blake Shelton

"Christmas music from Gwen is on the way," the source tells ET. According to BMI records, it also appears that the No Doubt singer has registered a handful of song titles for her holiday LP, including one she co-wrote with none other than her boyfriend, Blake Shelton.

A fan account got a hold of the registered songs, which features the title "You Make It Feel Like Christmas," co-written by the couple and Justin Tranter and Busbee.

EXCLUSIVE: Blake Shelton Opens Up About 'Very Personal' Gwen Stefani Duet, Says It Might Be the Best Song He's Ever Written

This isn't the first time that Shelton and Stefani worked together. The Voice coaches collaborated on the song "Go Ahead and Break My Heart."

ET spoke with Stefani last year about her experience writing the track with her significant other.

"Anytime I've ever collaborated with anyone, it's always my favorite," she admitted. "But to do something with him -- because he's so talented and comes from such a different world -- to make music together, it was just so shocking! So amazing to do it live and share it with everybody."

See more of what she had to say in the video below!