Even with longevity and plenty of onstage charisma, entertainers are not exempt from their own breed of stage fright, and many have been vocal about their struggles. On Thursday, New Kids on the Block singer Jonathan Knight walked offstage during the middle of a concert, prompting him to tweet apologies about his anxiety.
But Knight is hardly the first performer to spark questions about the severity of singers' and actors' apprehensions. Here are 16 celebrities who've acknowledged their bouts of stage fright.
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