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'X Factor'

Yes, Our Contestants Lip-Synch

But Other Shows Do Too

11/4/2011 10:30 AM PDT BY TMZ STAFF

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An "X Factor" performance last night revealed there's clearly lip-synching going down ... but a rep says the show is not alone, and it happens more often than you think.

During the opening song -- performed by all the contestants -- one singer started moving his mouth way after you could hear his voice. Oops.

An "X Factor" rep tells TMZ the vocals on all ensemble performances (not individual ones) are "pre-recorded" ... in order to give the contestants more time to work on competition songs.

The rep added, "This is also no different to what other competition shows do for ensemble performances."

The rep did not mention any of those "other" shows by name.

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