Pre-heat oven to 350 degrees. If using a stand mixer, fit with paddle attachment.
Mix together cake mix, lemonade concentrate, and sour cream.
Turn mixer speed to high and add in eggs, one at a time. Beat until combined.
Line with cupcake papers or spray 2 (12 spot) muffin pans. Scoop batter into cupcake liners, filling 2/3 of the way full.
Bake at 350 degrees for 20-25 minutes. Cool and frost with strawberry buttercream.