Photo Credits: Katy Perry: DLM Press, PacificCoastNews.com; Janet Mayer / PR Photos; Felipe Ramales, PacificCoastNews.com. Bar Refaeli: Janet Mayer / PR Photos; Ivan Nikolov/WENN.com. Carrie Underwood: © Country Music Television, Inc., Andrew Evans / PR Photos, Landmark / PR Photos. Selita Ebanks: Koi Sojer / PR Photos; Demis Maryannakis, PacificCoastNews.com; Janet Mayer / PR Photos. Blake Lively: Pedro Andrade, PacificCoastNews.com; PRN / PR Photos; Janet Mayer / PR Photos. Cameron Diaz: Landmark / PR Photos; Janet Mayer / PR Photos; Mario Santoro / PR Photos. Megan Fox: Albert L. Ortega / PR Photos; David Gabber / PR Photos. Nicole Scherzinger: PRN / PR Photos; Hector Vasquez, PacificCoastNews.com; Albert L. Ortega / PR Photos. Ashley Greene: Robin Wong / PR Photos; David Gabber / PR Photos; Brabus, PacificCoastNews.com. Nina Dobrev: Jean Catuffe, PacificCoastNews.com; Robin Wong / PR Photos; Chris Hatcher / PR Photos.