Champagne Hula

1 oz Malibu Pineapple Rum
3/4 oz Grand Marnier
1 oz pineapple juice
splash grenadine
3 oz champagne

Pour Pineapple Rum, Grand Marnier, pineapple juice, and grenadine in a shaker with ice. Shake and strain into a champagne flute. Add the champagne and serve garnished with a pineapple slice.