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

Mischa Barton went boho chic—wearing a Chopard white pearl necklace as a hair accessory—for the 10th annual White Tie and Tiara ball. Host Elton John welcomed Barton and other guests including Will and Jada Pinkett Smith, Uma Thurman and Naomi Campbell to his home in Old Windsor, England for the gala event, which raised funds for the Elton John AIDS Foundation.