Christmas Mimosas - 12 Servings--- We had these on Christmas morning as we were opening gifts and everyone wanted a second one (and a third!) Big hit! 4 cups cranberry juice, chilled 4 cups orange juice 2 (750 ml.) bottles Champagne, chilled 12 slices fresh orange, for garnish (optional) Fill twelve 12-ounce glasses with ice; pour 1/3 cup cranberry juice into each glass. Top each serving with 1/3 cup orange juice and about 1/2 cup Champagne. Garnish with orange slices, if desired.