The engaged couple have fun in the sun. Plus: Katie Holmes, the Olsens, Jessica Simpson and more

SIBLING REVELRY

Haylie and Hilary Duff show their love for Good Charlotte guitarist Benji Madden (Hilary's beau is his twin, Joel) when the sisters hosted the grand opening of the Red Buddha Lounge in Los Angeles on Thursday. Madden shared deejay duties with actor Shane West.