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Preheat oven to 350F. Spray and flour a bundt pan.
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In the bowl of a stand mixer fitted with a paddle attachment, beat butter until creamy. Add sugar and beat on medium speed for about 3 minutes, or until light and fluffy. Add eggs, one at a time, beating after each one. Beat in lemon zest and vanilla.
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Add butter to flour mixture, alternating with the lemon-lime soft drink, beginning and ending with the flour. Beat until just combined.
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Pour into the prepared bundt pan and bake 60 - 56 minutes or until a toothpick inserted into the center comes out clean. Cover with aluminum foil after 40 minutes if it looks like it's browning too much.
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Cool in bundt pan for 10 minutes before removing to wire rack. Cool completely before glazing.