Preheat oven to 350°F. Grease and flour three 8-inch round cake pans and line the bottoms with parchment paper.
In another bowl, whisk buttermilk, lemon juice, lemon zest, eggs, and vanilla extract until well combined.
Divide the batter evenly among the prepared pans. Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean