Gwen Stefani and Blake Shelton are getting married and already busy planning their winter wedding!

Sources reveal exclusively to Life & Style magazine that the country singer is taking his stepdad role very seriously — and planning to include Gwen three sons, Kingston, 10, Zuma, 7 and two-year-old Apollo, into the nuptials.

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"Apollo wants to be the ring bearer, and the two older boys will be junior groomsmen with Blake,” says the insider. “Blake wants it to be really special, to show them coming together as a family.”

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So what else can fans expect from the couple's Christmas ceremony?

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"They’re planning a December wedding at Blake’s ranch in Oklahoma,” an insider explains, “because Gwen and the boys love it there and it will give them a lot of privacy.”

For more celebrity news, pick up the latest issue of Life & Style, on newsstands now! In the meantime, click through the gallery below for more cute pics of the couple!