Katherine Kallinis is a well-known American entrepreneur and co-owner of the popular bakery Georgetown Cupcake, which she founded with her sister, Sophie Kallinis LaMontagne. The bakery gained fame through its delicious cupcakes and was featured on the reality TV show DC Cupcakes, showcasing their journey in the competitive baking industry. Katherine has a background in business and has worked in various roles before fully committing to the bakery. She is recognized for her creativity in cupcake flavors and designs, contributing to the brand's success and expansion beyond its original location in Washington, D.C..