Cook vanilla pudding according to package directions and stir until cold.
Beat butter, powdered sugar and lemon juice until fluffy.
Mix the cooled pudding with the eggnog and stir well into the buttercream mixture.
Cook vanilla pudding according to package directions and stir until cold.
Beat butter, powdered sugar and lemon juice until fluffy.
Mix the cooled pudding with the eggnog and stir well into the buttercream mixture.