Kelly Osbourne
Credit: Theo Wargo/WireImage

Anna Kendrick (in James Jeans), Kelly Osbourne (in Vivienne Westwood) and Camilla Belle (in Jason Wu) stuck together at the launch of the Samsung Galaxy Note 10.1 at Lincoln Center in New York City. "Thank you so much @followWestwood for lending me this is dress!" Osbourne Tweeted, with an instagram shot of her flirty pastel frock. Click through to see Nikki Reed, Heidi Klum and more stars at this week's hottest events.