Carrie Underwood Quenches Her Thirst

Carrie Underwood is drinking her vitamins. The country superstar has become an official spokesperson for Glacéau's Vitaminwater.

"I have a hectic schedule and Vitaminwater really helps to keep me going," Underwood writes on her website. "I like to have a lot of energy on stage, and since Vitaminwater Energy happens to be my favorite flavor, I'm thrilled to have my name on it."

In addition to appearing in Vitaminwater commercials, Underwood is also co-creating a limited-edition label for the energy drink that will feature fun facts about her life. She joins an impressive list of celebrities who endorse the product, including Kelly Clarkson, 50 Cent, and basketball star Tony Parker.