Andres and Andrew pitch the sisters on doing something a little outside their comfort zone -- creating a giant tattoo out of cupcakes for the DC Tattoo Expo. Meanwhile, Andres must manage a special bachelorette cupcake order in the shop.

It's the moment Mommy has been waiting for - Katherine is finally engaged! To celebrate the news, Sophie and Mommy plan a surprise engagement party, complete with a giant engagement ring made out of cupcakes.

Sisters and owners of "Georgetown Cupcake," Sophie and Katherine take on their biggest project ever - Katherine's wedding! Watch the stress and strain of planning take its toll on both sisters, as they fight to get Katherine down the aisle.