Gwen Stefani spent Tuesday on a lake with boyfriend Blake Shelton and her youngest son.
Stefani posted several photos on Instagram and Instagram Stories from her day with Shelton. She wore a minimal makeup look, fringe crop top and beaded necklaces.
"#oklahoma #summer @blakeshelton thank u for sharing your world," the star captioned one picture, adding a heart emoji. "#nextstopvegas."
Shelton can be seen driving a boat in another snapshot on Stefani's account.
Stefani also documented Apollo investigating bird nests on the shores of the lake.
The singer is parent to Apollo, 9-year-old son Zuma and 12-year-old son Kingston with ex-husband Gavin Rossdale.
Stefani marked the occasion in a post to Shelton on Instagram, and followed up with a photo of herself with the country star.
"Birthday love u @blakeshelton gx," the singer said.