1. Preheat oven to 350 degrees and line pans with cupcake liners.
2. Sift cake mix into a small bowl and set aside.
3. Combine all other cake ingredients until smooth,.
4. Add cake mix and stir well.
5. Fill cupcake liners 3/4 full and bake for 17-23 minutes, or until and inserted knife comes out clean.
6. Strawberry Buttercream: Beat butter for two minutes. Add vanilla extract and strawberry gelatin (you can use fresh strawberries as a substitute). Slowly add powdered sugar until you reach your desired consistency.
7. Pipe buttercream onto cooled cupcakes and top with a fresh lime slice.