X Factor has been known as a reality series featuring live performances ... until now.

The hit FOX show is admitting that some of the performers do get vocal assistance from pre-recorded tracks.

In a statement, FOX says:

    "All survival songs are performed live, with just a backing track. For the group ensemble performance, the vocals are prerecorded to allow acts to concentrate on preparing for their own live competitive performances on Wednesdays—this is also no different to what other competition shows do for ensemble performances."

The controversy surfaced after viewers noticed a group number, as well as contestant LeRoy Bell, were lip-syncing during several X Factor performances. Yikes!