Gwen Stefani and Blake Shelton will soon have two reasons to celebrate!

The couple is still busy planning their upcoming wedding, but sources reveal exclusively to Life & Style that a baby is also just around the corner.

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"They've started talking about adoption," the insider says. "It might be a baby or it might be a toddler. But no matter what, they want to have a little girl in their arms by the end of 2017."

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Gwen, 47, and Blake, 40, are looking at all their options, including IVF, and "will do whatever it takes to have a baby girl," the source adds.

We're sure the No Doubt rocker's three boys, Kingston, 10, Zuma, 8, and Apollo, 2, are thrilled!

For more exclusive celebrity news, pick up the latest issue of Life & Style, on newsstands now! And scroll down to see more cute pics of Blake and Gwen on their Disneyland trip.