Grapefruit Cupcakes

"The icing is luscious made with cream cheese instead of butter as in a buttercream. Is icing the best part for you? Then it has to be good, right!! The cake though is moist and tender. I love adding in sour cream to my cakes and cupcakes, it gives them the right texture and then they are nice and moist too. Enjoy these cupcakes for any occasion or just make them for Spring!! Delicious no matter when you serve them."