David Arquette - Courteney CoxMichael Buckner/WireImage

In Hollywood, Courteney Cox and David Arquette put their star power to good use at the Beau Joie Champagne dinner to benefit children’s charity The Art of Elysium. “Anytime you can use your celebrity to bring awareness and money to something that matters—you do it!” Cox declared, as daughter Coco busied herself by charming the star guests. Click through the gallery to see Rachel Bilson, Emma Roberts, Diane Kruger and more stars at last night’s hottest parties!