I have no idea how much batter to use to bake in a 12" by 2", 10" by 2", and 6" by 2" heart shaped pan. I have never used pans shaped like these and I don't have any idea how much batter it will take.

12" takes 8 cups
10" takes 5 cups
6" takes 1 1/2 cups

Here's the link I use when I question how much batter I need for a pan:
http://www.wilton.com/cake/cakeprep/baking/times/wedding_2inch.cfm

here is a link to a chart from Wilton that tells you how much batter you need for youo cake pans. It will even tell you how much frosting you will need to frost it. HTH

http://www.wilton.com/cake/cakeprep/baking/times/party_2inch.cfm

Awesome! Thank you guys!