BROOMFIELD, Colo., April 29, 2020 /PRNewswire/ -- Today Silk®, America's No. 1 plant-based beverage brand, announced it has teamed up with two of the world's most recognizable athletes—Michael Phelps, one of the most decorated athletes of all time, and Aly Raisman, world champion gymnast—as the new faces of its soymilk portfolio.