Beyonce Knowles, Rihanna, Jay Z & others at The Costume Institute Gala 2015

Coverage of The Costume Institute Gala 2015 with Beyonce Knowles, Rihanna, Jay Z, Madonna, Jennifer Lopez, Lady Gaga, George Clooney, Amal Alamuddin, Kim Kardashian, Kanye West, Katy Perry, Cher, Justin Bieber, Kate Hudson, Robert Pattinson, FKA twigs, Jennifer Lawrence, Sofia Vergara, Joe Manganiello, Miley Cyrus, Kendall Jenner, Selena Gomez, Anne Hathaway, Katie Holmes, Lorde, Kerry Washington, Derek Jeter, Hannah Davis, Sarah Jessica Parker, Aaron Rodgers, Olivia Munn, Jessica Alba, Cara Delevingne, Ros