1 (12 ounce) can apricot nectar, chilled
1 (12 ounce) can pineapple juice, chilled
1 (6 ounce) can frozen orange juice concentrate, thawed and undiluted
1 (750 milliliter) bottle Champagne
Combine apricot nectar, pineapple juice, and orange juice concentrate in a large pitcher. Stir in Champagne just before serving.