Add orange juice and strawberries to a blender. Blender until smooth on high speed.
Fill flutes 1/4 of the way with the strawberry orange mixture.
Fill the rest of the way with champagne.
Garnish with a strawberry and serve!
notes
You can also combine the strawberry orange mixture and the full bottle of champagne in a pitcher if you want! This is great for a party or if you don't want to build the mimosas individually, one at a time.