Oooh, I googled the sentiment on the stamp thinking surely someone had to have credited it somewhere - and found this very stamper's blog since the cards weren't in her Etsy shop. :) She credits this company: http://thecuttingcafe.typepad.com/the_cutting_cafe/2009/01/all-about-cupcakes-.html
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http://thecuttingcafe.typepad.com/the_cutting_cafe/2009/01/all-about-cupcakes-.html