Carrie Underwood has secured an endorsement deal with Vitaminwater energy drink, which will market a limited-edition bottle this summer. She'll also be featured in upcoming commercials for the drink. Underwood joins fellow American Idol winner Kelly Clarkson, as well as 50 Cent and LeBron James, as celebrity partners. "I have a hectic schedule, and Vitaminwater really helps to keep me going," Underwood said. "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."