As Life & Style previously reported, Blake Shelton and Gwen Stefani are currently planning a Christmas wedding — but they have to hash out a prenup first!

“The prenup will dictate that their earnings remain separate,” an insider tells Life & Style, adding that their combined fortune is a whopping $225 million.

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The mother-of-three will keep her Beverly Hills mansion under her name, while the country crooner's Oklahoma ranch will stay under his. Neither will seek spousal support if the marriage ends.

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“Blake said he didn’t want [a prenup], but Gwen wants to make sure they are both protected,” the insider adds, noting that the blonde beauty didn't have one with ex Gavin Rossdale.

For more on Gwake’s upcoming nuptials, pick up the latest issue of Life & Style, on newsstands now! And scroll through the gallery below for cute photos of the happy couple.