In a medium bowl or measuring cup, combine quartered strawberries with Grand Marnier. Cover with plastic wrap and soak for at least 2 hours at room temperature or overnight in the fridge. Stir occasionally.
Place soaked strawberries and frozen whipped topping in a blender or food processor. Blend until smooth.
Fill in popsicle molds and freeze for a minimum of 24 hours.
Run molds under hot water before attempting to remove.