Pour the desired amount of sparkling wine into the Champagne flutes, filling each glass about half full.
Pour the peach nectar and orange juice into a pitcher and stir to combine.
Top off the wine with your desired amount of peach-orange blend until the glass is full.
Serve garnished with fresh peach slices.
Notes
To make ahead: The peach and orange juice mixture can be made up to 24 hours in advance. Simply store it in a pitcher or jar in the fridge until you're ready to use it.Leftovers: Any leftover mimosas can be stored in the fridge for up to 48 hours. Simply cover the glasses with plastic wrap or transfer the mimosa into a sealed container. When you're ready to enjoy, give it a quick stir and garnish with peach slices before serving!