Kardashian poses with an artistic fan in London. Plus: Natalie Portman, Zac Efron, Keith & Nicole and more

PARTY HOPPER

Following her surprise appearance on stage at Yankee Stadium during Jay-Z and Eminem's star-studded concert Monday night, Beyoncé (in Roberto Cavalli) happily hits the afterparty at New York's 40/40 Club.



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