Preheat the oven to 350°F (175°C). Grease and flour a heart-shaped cake pan.

In a mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

In another bowl, whisk together the flour, baking powder, and salt.

Gradually add the dry ingredients to the wet ingredients, alternating with the milk, until just combined.

Pour the batter into the prepared cake pan and smooth the top.

Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.

Allow the cake to cool in the pan for 10 minutes, then turn out onto a wire rack to cool completely.

In a mixing bowl, beat together the softened butter and powdered sugar until smooth.

Add the heavy cream and vanilla extract, and beat until fluffy. If desired, add red food coloring to achieve the desired color.

Once the cake is completely cool, spread the frosting evenly over the top and sides of the cake.

Decorate with sprinkles or fresh berries if desired.

Slice and serve to enjoy your heart-shaped cake!