Preheat the oven to 350 degrees, and grease the pan of your choice. Preferably 8 or 9 inch pan or cupcake pan. Cream together the sugar and butter, then add the eggs one at a time. Add the vanilla and pudding mix along with the zest of the orange. Stir in the flour. Add a ½ cup of orange juice to the cake mixture and mix well.
Pour into the pan, and bake for 45-50 minutes to an hour. It may need more time depending on your oven.
To make the frosting: Beat the confectioners' sugar and butter. Add in the vanilla and orange juice and milk to achieve desired consistency.
Recipe by Kitchen Belleicious at https://kitchenbelleicious.com/2015/02/10/vanilla-valentine-heart-cake/