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With nine years of producing under her belt, Tara Montgomery says rehearsing with Tina Turner was definitely a highlight. "It was a total thrill. She didn't know she was a surprise [guest], so when she found out, she was so excited," Tara says. "I got to be you [Oprah] for the rehearsal, and we had to rehearse several times. Tina wanted to hug you and greet you, so I said, 'Okay, I'll be Oprah!' It was a complete thrill!"