LOL: Ariana Grande Gets Totally Shocked by Flash Mob!

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Ariana Grande was in for the surprise of her life when an interview she was giving abruptly ended... and a flash mob broke out! The interviewer, Todrick Hall, walked away from Ariana, started dancing, and tons of dancers from the crowd ran to join him.

And the biggest surprise of all? Watch the video below to see Ariana's brother Frankie Grande make a special guest appearance!

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