Champagne Cupcakes with Champagne Buttercream Frosting

I've had exquisite champagne cake before at a local bakery and wanted to try my hand at a cupcake version.  I think next time I would just use plain champagne instead of a rose.  These still turned out quite good.  Recipe off thecurvycarrot.com.

Champagne Cupcakes with Champagne Buttercream

Servings: About 20-22 cupcakes
For the cupcakes
2 and 3/4 cups all-purpose flour
3 teaspoons baking powder
1 teaspoon salt
2/3 cup unsalted butter, at room temperature
1 and 1/2 cups white sugar
3/4 cup champagne**I used a light pink rosé.
6 egg whites
For the buttercream frosting
3 and 1/4 cups powdered sugar
1 cup unsalted butter, at room temperature
1/2 teaspoon vanilla extract
3 tablespoons champagne, at room temperature

1. For the cupcakes: Preheat oven to 350 degrees.
2. Line cupcake pans with paper liners.
3. In a large bowl, cream together butter and sugar until very light and fluffy.
4. Sift flour, baking powder, and salt together, and then blend into creamed mixture alternately with champagne.
5. In another large clean bowl, beat egg whites until stiff peaks form.
6. Fold 1/3 of the whites into batter to lighten it, then fold in remaining egg whites.
7. Fill the cupcake liners about 2/3 full.
8. Bake at 350 degrees for 20 minutes, or until a toothpick inserted into the cake comes out clean.
9. For the frosting: With an electric mixer, beat together sugar and butter.
10. Mix on low until well blended, and then on medium for another two minutes.
11. Add vanilla and champagne, beating on medium for another minute.
12.  Pipe onto cooled cupcakes.