Gwen Stefani and Blake Shelton
Gwen Stefani and Blake Shelton have been dating since 2015 Reuters

Gwen Stefani allegedly wants to have a baby with Blake Shelton. The duo reportedly want to have a child before the end of the year.

According to a report in Life & Style, the couple are eager to start a family together, and the 47-year-old singer has been undergoing in vitro fertilization treatments. A source said: "They're trying to have a baby first. That's their main focus right now. [Gwen'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."

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

Gwen reportedly want her sons - Kingston, Zuma, and Apollo, to bond with Shelton. The source said: "[They're] still dealing with the emotional fallout of the split. Gwen wants to make sure they're 100 percent ready for her to marry Blake."

In July 2015, Blake and Miranda Lambert announced their divorce after four years of marriage. The couple released a statement to E! News saying: "This is not the future we envisioned. And it is with heavy hearts that we move forward separately. We are real people, with real lives, with real families, friends and colleagues. Therefore, we kindly ask for privacy and compassion concerning this very personal matter."

The following month, Gwen and Gavin Rossdale revealed they are splitting after 13 years of marriage. They said in a joint statement: "While the two of us have come to the mutual decision that we will no longer be partners in marriage, we remain partners in parenthood and are committed to jointly raising our three sons in a happy and healthy environment. To that end, we respectfully request privacy from the media during this time."