Beyoncé turned heads in Philadelphia after showing up to support Jay-Z during a special preview event ahead of his highly anticipated performance at The Roots Picnic festival. Before the rapper's official festival performance, Jay-Z gave a select crowd an early look at what he’s preparing, previewing portions of the show during an intimate Philadelphia stop ... but while the focus was on the music, it didn’t take long for attention to shift when Beyoncé was spotted in attendance, quietly