Both cocktails are made with Champagne and fruit juice, but the difference is in the type of fruit juices that's used. A peach bellini is traditionally made with white peach puree, while a mimosa is made with orange juice. I consider this recipe to be a perfect mix of bellini and mimosa, combining in-season puréed fresh peaches with peach nectar and fresh orange juice. The flavor profile is bright, sweet, summery, and absolutely delicious!