Slice the large flesh sides of your mangoes off, gently cut one inch cubes into the flesh of the slices (don't cut through the skin). Use a spoon to scoop the mango flesh out of the skin and place in a bowl to the side.
Slice the skin off of your kiwis, cut into fourths horizontally, then cut each slice into quarters. Place the kiwis in the bowl with the diced mangoes.
Pour 1 cup of champagne over the fruit and let it soak for at least 20 minutes.
Once the fruit has soaked, scoop 1/4 cup of the fruit into your champagne or cocktail glass. Pour your desired amount of champagne into the glass. Top with your desired amount of orange mango juice.
Garnish with a sliced kiwi and enjoy!