It's Mommy's 60th birthday and Sophie & Katherine want to honor her in the best way -- with a surprise party, complete with a Greek statue of Mommy made out of cupcakes. Meanwhile, it's a busy weekend at the shop as the Sisters must fill 8 wedding orders.

After opening two successful shops, Sophie is ready for expansion with her eyes set on New York City. But her sister Katherine has reservations about the idea, especially after seeing the only potential location they can afford.

The competition is on when Sophie and Katherine decide to see who can sell the most cupcakes in one week....Sophie in New York or Katherine in Boston. They each enlist the help of an iconic baseball player from their city.