Drain the pineapple but reserve 2 Tablespoons of the juice. Place pineapple, lemon juice, lime juice, sugar, and reserved 2 Tablespoons of juice in the blender and blend until smooth. Make sure that there aren’t any chunks left. Pour into two gallon sized bags and lay flat in the freezer and freeze about 1 - 1 1/2 hours until slushy. Whip the whip cream with a hand mixer or stand mixer until it forms soft peaks. Transfer into a large bowl and fold the slushy pineapple mixture into the whipped cream. Return to the freezer and freeze until completely frozen about another hour. Scoop the mixture into a cup and pour pineapple juice on top to make it a float!