Day 4 of voting was a fun day: wedding cakes, flowers and signature cocktails! John Corbett and Nia Vardalos were both on the show again this morning, so John and John tasted cakes with Matt Lauer while Kaitlin and Nia talked flowers with Savannah Guthrie. First up: the cake! Photos by Sylvia Weinstock Cakes Out of all the bakeries in New York City, the TODAY Show got celebrity cake maker Sylvia Weinstock, who has baked cakes for Oprah and Martha Stewart, to create a …