Rihanna Greets Fans Ahead of Concert with Surprise Jay-Z Performance

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Rihanna had no problem taking time to pose with fans and sign autographs before a New Jersey concert last night in which Jay-Z surprised the crowd and joined the singer onstage. 
Rihanna -- who emerged from her hotel Thursday with a pony tail and wearing a sexy black dress -- decided to delight the waiting crowd before heading to her concert at the IZOD Center in East Rutherford, NJ.
At one point during the concert, Jay-Z rose from some smoke onstage to the surprise of a full house to perform with Rihanna the smash hit "Run This Town."