Taylor Swift in Santa Clara: Joan Baez, Julia Roberts, Fifth Harmony

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Taylor Swift invited Joan Baez and Julia Roberts to join her onstage Saturday night in Santa Clara, and the two superstars from previous generations wiggled along through the rest of Swift's performance of "Style."

>>Video: Joan Baez and Julia Roberts join Taylor Swift onstage

The night before, the girl group Fifth Harmony performed “Worth It” with Swift.

>>Video: Taylor Swift performs with Fifth Harmony