The lives of several couples and singles intertwine over the course of New Year's Eve in New York City. Starring Robert De Niro, Katherine Heigl, Lea Michele, Ashton Kutcher, Hilary Swank, Michelle Pfeiffer, Zac Efron, Abigail Breslin, Sofia Vergara, Jessica Biel, Halle Berry, Sarah Jessica Parker, Sienna Miller, Jon Bon Jovi, Ice Cube, Josh Duhamel & Greg Kinnear.