Gwen Stefani, Blake Shelton enjoy family time in Oklahoma

TISHOMINGO, Okla., Sept. 6 (UPI) -- Gwen Stefani and boyfriend Blake Shelton made family a priority over Labor Day weekend.

The 46-year-old singer and 40-year-old country star spent the holiday with Stefani's three sons, 10-year-old Kingston, 8-year-old Zuma and 2-year-old Apollo, at Shelton's ranch in Tishomingo, Okla.

Stefani was all smiles in a series of Snapchat posts Monday while spending the day on the lake with her loved ones. She had posted a photo of herself and Shelton wearing Hawaiian shirts the day previous.

The "Used to Love You" singer shares her sons with ex-husband Gavin Rossdale. Sources told Us Weekly in June that Shelton, who has no children of his own, is thrilled to be bonding with Stefani's kids.

"[They've become] close and closer," an insider told the magazine. "The boys love him ... Blake always wanted a family, and it's looking like he got one."

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Gwen Stefani with Blake Shelton and her three sons on Labor Day. Photo by Gwen Stefani/Snapchat

Stefani and Shelton confirmed their relationship in November following their splits from their respective spouses, Rossdale and Miranda Lambert, in 2015. Insiders told People in August that the pair are now happier than ever.

"All the things that need to work out for two people to merge lives have worked out," a source said. "Everyone close to them is very happy they are together."