Gwen Stefani and Blake Shelton planned to tie the knot later this year, but the couple has put the wedding on the back burner.

Sources are revealing exclusively to Life & Style that Gwen, 47, and Blake, 40, are determined to have a baby first.

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"That's their main focus right now," an insider says. "She's determined to have another baby and carry it herself, even though Blake has said it doesn't matter if they adopt or get a surrogate."

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The "Hollaback Girl" singer has been undergoing in vitro fertilization treatments for a year with no success and has decided to take a break from the process.

"Physically and emotionally, it was just a lot for her. So she's trying to get pregnant naturally for the time being," the source explained.

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Gwen is already mom to sons, Kingston, 10, Zuma, 8 and Apollo, 2, but ready to expand her family with the country crooner.

gwen stefani kids with blake splash

Last year, Life & Style reported that the duo, who met while filming The Voice, were trying for a baby girl.

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"It might be a baby, or it might be a toddler," a source added. "But no matter what, they want to have a little girl in their arms by the end of 2017."

It's no surprise she is ready to take their relationship to the next level. Gwen couldn't stop talking about Blake on Late Night With Seth Meyers, telling the talk show host, "I love Blake! He is the most incredible guy. Everybody loves Blake, and that's the thing. There's no way around it. He's just a sparkly like happy, amazing person."

We can't wait!

For more exclusive celebrity news, be sure to pick up the latest issue of Life & Style magazine, on newsstands now! For a look at Gwen and Blake's cutest moments, click through the gallery below!