Beyonce Makes a Backstage Surprise at L.A. Dance Show, Freaks Out the Troupe (VIDEO + PHOTO)

[[tmz:video id=”0_9l7f7gsq”]] Beyonce freaked out a dance troupe in L.A. when she popped in backstage after their show and gave ’em some huge props. Bey and mom Tina Knowles hit up the Alvin Ailey American Dance Theater show…

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