After four years together,Blake Sheltonand Gwen Stefani areready to take the next step.

“Blake was very serious about Gwenright from the start, and early on he thought about proposing,” says a Stefani insider. But the former No Doubt rocker, who is a practicing Roman Catholic, hopes to have a church ceremony with the country star. (Stefani, 50, waspreviously wed to Bush frontman Gavin Rossdale, 54, for 13 years before the pair split in 2015.)

december 23 2019 cover featuring Gwen Stefani and Blake Shelton

Still, theVoicecoaches are certain they’ve found “the one” in each other and are “very serious” about their relationship, says a friend of the couple. “It’s definitelyheaded toward marriage.”

Over the last few years, Shelton, 43, has become a second father figure toStefani’s sons, Kingston, 13, Zuma, 11, and Apollo, 5, and the singers’ respective families have also become close.

WATCH:Blake SheltonandGwen StefaniHave Been Talking About Wedding Bells!

Gwen Stefani and Blake Shelton.Todd Williamson/Getty Images

Gwen Stefani and Blake Shelton

And now with any heartbreak firmly in the past, the couple are focused on living a full life together.

For all the details onBlake SheltonandGwen Stefani’s blissful romance and plans for the future, pick up the latest issue of PEOPLE, on newsstands Friday.

source: people.com