Gwen Stefani and Blake Shelton have been spending tons of time with her three children, Kingston, 9, Zuma, 7, and Apollo, 2, in the months since their relationship began.

From trips to the park to trips to the movies, The Voice couple appears to be one big happy family.

“Blake is amazing with the kids. He’s such a big kid himself and loves doing all the same things as they do,” an insider told Hollywood Life earlier this month. “One of his favorite things to do with them is go on hikes — they love Malibu Creek. They get out there in the mud, hunting for frogs or playing hide-and-seek. Blake loves any excuse to get outside and get dirty, so he’s a big hit with Gwen’s kids."

Meanwhile, Rossdale has reportedly been going crazy at the thought of another man spending so much quality time with his three kids.

"It drives Gavin nuts that his kids have bonded with Blake," the source explained. "He hates that they’re spending so much time with him. He doesn’t have any say in it…and it’s killing him.”

Just last week, Stefani and Rossdale's 7-year-old, Zuma, was seen in the audience at the Nickelodeon Kid's Choice Awards, where he was showing his support for Shelton, who hosted the show.

For more of Gwen Stefani and Blake Shelton, tune into The Voice Season 10, airing on Monday and Tuesday nights at 8 p.m. on NBC.