Preheat oven to 350°. Insert paper liners into 20 muffin cups; set aside.
Beat cake mix, 1 cup orange juice, and next 5 ingredients at low speed with an electric mixer until combined. Scrape sides of bowl with spatula, and beat at medium speed 2 minutes or until batter is thick and well combined. Spoon about 1/3 cup batter into each liner.
Bake at 350° for 18 to 22 minutes or until a wooden pick inserted in center comes out clean.
Brush tops of warm cupcakes evenly with remaining 2 tablespoons orange juice. Let cool in pans on wire racks 5 minutes. Remove from pans, and let cool completely on wire racks.
Spread about 1 heaping tablespoon of Marmalade Buttercream Frosting on each cupcake. Store at room temperature in an airtight container up to 3 days, up to a week in refrigerator, or (unfrosted) up to 6 months in freezer.