Celebrities Pour Ice water over their heads : <br />Justin Timberlake <br />Selena Gomez <br />Jennifer Lopez <br />Lady Gaga <br />Britney Spears <br />Kaley Cuoco <br />Justin Bieber <br />Tom Hiddleston <br />James Franco <br />Tyler Hoechlin <br />Alessandra Ambrosio <br />Bill Gates <br />Lily Allen <br />George W. Bush <br />Mark Zuckerberg <br />P.K. Subban <br />Austin North <br />Cheryl Cole <br />Sabrina Carpenter <br />Ryan Rottman <br />Lily Aldridge <br />Italia Ricci <br />Conan O'Brien <br />Billy Unger <br />Robbie Amell <br />Lena Dunham <br />Gwyneth Paltrow <br />Rachel Riley <br />Emmy Rossum <br />Brian Vickers
