In a large bowl mix the popcorn and conversation hearts together and set aside.

In a medium sauce pan over medium heat combine the sugar, corn syrup, and butter. Cook over medium heat until the mixture comes to a boil. Stirring often let the mixture boil for 3 minutes.

Remove from the heat and stir in the salt, vanilla, and food coloring. Pour the sugar mixture over the popcorn mixture in the bowl and stir well until everything is evenly coated. Turn the mixture onto waxed paper and then sprinkle on the heart sprinkles before the coating cools. Let the popcorn cool completely before enjoying.