She even told PEOPLE that she wants to be the First Lady. "She's such an incredible woman, and she's with such a powerful man," Simpson said. "Everything she does she exudes confidence," says the singer. "I'm really just here to celebrate her."
Simpson was among numerous stars, including 'Sex and the City' star Kristin Davis, Michael Douglas and Bradley Cooper, who came out for the annual event.
During the event, President Barack Obama took a dig at Jay Leno, calling him "the only person whose ratings fell more than mine."
