Preheat your oven to 350 degrees fahrenheit, and line a muffin tin with cupcake liners.
In a large mixing bowl, whisk together cake mix, 1 ¼ cups champagne, vegetable oil, and eggs.
Add cake batter to cupcake cups, filling about ⅔ full.
Bake for 17-20 minutes. Allow the cupcakes to cool completely before frosting.
For the frosting, in a large mixing bowl, beat the butter together until smooth.
Add powdered sugar and strawberry powder, and mix well to combine.
Add heavy cream and Champagne, and mix well, for 1-2 minutes.
Add frosting to a piping bag set up with a 1M star tip.
Frost the cupcakes, and enjoy!