Gwen Stefani was recently spotted packing on some PDA with boyfriend Blake Shelton at a theme park. The two were there to celebrate the No Doubt singer’s son Kingston's 13th birthday a little early. Her two other children, 10-year-old Zuma and 5-year-old Apollo, were also with her.

Stefani and Shelton were recently spotted enjoying the weekend with the kids at Knott’s Berry Farm in Buena Park, California. Kingston's birthday is later this month, but the family decided to celebrate the occasion a little early. During the trip, the two singers managed to get some time for themselves and were seen showing off some PDA, ET Online reported.

Shelton wore a blue shirt and blue jeans for the family outing, finishing off the casual look with a baseball cap. Stefani, on the other hand, wore a patchwork green jacket and jeans. The highlight of her look was a pair of neon Moschino sneakers.

A source previously revealed that both Shelton and Stefani have been “happier than they’ve ever been.” The country singer is reportedly getting along really well with the kids, and the boys apparently “adore” him.

Shelton and Stefani have been co-parenting the kids, according to insiders. The country singer is said to be a “huge” part of the children’s lives, and the boys have reportedly started to pick up his country looks and they have started to dress like him.

Pictures of Shelton and Stefani that have surfaced online showed them holding hands while exploring Knott’s Berry Farm, E! News reported. Some of the rides that they took include Calico River Rapids ride and the Timber Mountain Log Ride.

Both the singers are busy with their careers and get very few opportunities to go out together as a family. Shelton has just released his new song “God’s Country,” but he told Entertainment Tonight recently that he doesn’t want to release a new album this year.

The country singer, however, admitted that he may be pressured by the record company people to launch an album at some point in the future, but at the moment he has no plans to do it.