Preheat the oven to 350 degrres.

In a large bowl combine the butter and powdered sugar. Mix until smooth.

Add in the lemon juice, lemon zest, and vanilla and mix well.

Stir in the flour until a soft dough forms. Cover the bowl and refrigerate for 10 minutes.

Remove the dough from the refrigerator. Sprinkle a surface with powdered sugar and roll to 1/4 inch thickness. Cut out into heart shapes. Roll the dough again and cut out more heart shapes.

Place the heart shaped cookies onto a baking sheet. Bake for 10 minutes.

Remove the baking sheet from the oven and allow to cool for 2 minutes before removing to a wire rack. Cool completely.

Meanwhile, combine the powdered sugar and lemon juice in a small bowl.

Spread a teaspoon of glaze on top of each cookie and immediately sprinkle with the sprinkles. Allow the glaze to set for 15 minutes before eating or storing.