The singer puts on an eye-popping performance in Boston. Plus: Lindsay Lohan, Nicole Richie and more

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SUNNY SIDE UP

Are they taking a cue from Joel Madden? Kelly Osbourne and fiancé Luke Worrall make a perfect match with their lighter locks at Nylon magazine's Young Hollywood issue party Monday at the Hollywood Roosevelt Hotel. "I think I look like a Barbie doll that's cut the hair off," Osbourne told PEOPLE at the party.