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

Rihanna and Akon brought the buttoned-up crowd to their feet as they shared the stage at Cipriani for the Wall Street Concert Series to benefit the Sarah Ferguson Foundation and UNICEF. "I'm going to make them sweat," said Akon, who stayed true to his word by stripping down layer by layer as he performed songs like "Smack That," until, much to the dismay of the crowd of women who had rushed the stage, the DJ persuaded him to keep a few items of clothing on.