Colbie Caillat's career took off with her hit single Bubbly. "I’ve been in seven different countries and all over the U.S. traveling on the tour bus," she says in the On3 Productions gift lounge at Z100's Jingle Ball. "It’s a whole new lifestyle." She has a famous fan: Hayden Panettiere. "Oh, I like her," the Heroes actress confessed backstage.