Parties! The style, stars and scoop from Hollywood's hottest events

Pop princess Rihanna swept into her album release party—which also doubled as the evening's hottest post-MTV Movie Awards bash—at Sugar in Hollywood. “I’ve never had a release party before,” revealed the "Umbrella" singer, who matched her fuchsia lipstick to her waistband and her black nails to her sleek new bob. “I’m excited to be here to support Rihanna, I’m a friend of hers,” said cheerleading Hero Hayden Panettiere as she moved to the dancehall reggae being spun by Rihanna’s tour DJ, Max Glazer. But it was Jay-Z who summed the entire evening. “We’re at the top of the charts, top of the world and that’s a fantastic feeling,” the rap mogul declared.