This is similar to a Mimosa. The main difference is that this drink is 2/3 Champagne and 1/3 orange juice. Where a Mimosa is half Champagne and half orange juice. A slight difference, but enough to warrant a new name.
Fill a Champagne glass 1/3 of the way with orange juice. Top off the glass with 2/3 Champagne. Do not stir! Add an orange twist for garnish and enjoy!