Fans were angry to Cheryl's pledge last week promise of this "100 percent" live singing.
But then a few lines at the end the track before the results show pre-recorded Cheryl, 27, Sung.
A source said: "Cheryl's routine was very energiereich.Es was unable to sing anything."
Fans who are placed in the star on Twitter.
Gav Knight wrote: "Ironic Cheryl criticized live performances then mimes."
Meanwhile was Piers Morgan found yesterday weeping Cheryl from the viewers watched almost drawn Saturday of night's life stories - 7.8 million.
With minutes to spare persuaded it to appear to "stop speculation".
