Gwen Stefani sent her boyfriend Blake Shelton a loving message on Father's Day.

In an Instagram post, the "Hollaback Girl" singer thanked her partner for the support he's given her in raising her three sons from her previous marriage to Gavin Rossdale: Kingston, 14, Zuma, 11, and Apollo, 6.

"Happy father’s day @blakeshelton thank u for helping me raise these boys!! #weloveyou! G❤️K❤️Z❤️A gx" she wrote alongside several photos of Shelton with her children. She signed the note with their first initials.

Shelton and Stefani have reportedly been dating since 2015.

Last month, Stefani shared a video of Shelton, who she describes as her "best friend," showering her oldest son Kingston with love on his 14th birthday.

Stefani also spoke about her close relationship with Shelton to "Good Morning America" in June 2018.

"He's my homeboy. He's my homey. He's just really an amazing all-around human so I feel so grateful for that," she said.