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DONNY and MARIE OSMOND are touring the U.K. with brothers ALAN, WAYNE, MERRILL, JAY and JIMMY, and ET is backstage with the entertaining clan!

Donny surprises Marie with the ET cameras just minutes before they're set to go onstage -- and then barges in on his brothers to see if they are ready! So, what went wrong during their "A little bit country, a little bit rock 'n' roll" duet? And did everyone hit their marks during the last performance?

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