The singer will return to the ITV talent show as a bona fide contestant when the live shows begin on Saturday (31 October).
Monica Michael is returning to 'The X Factor'
News of her return comes just days after Rita Ora dumped her from her category, following Judges Houses.
It was announced by Simon Cowell on Thursday’s edition of ‘The Xtra Factor’ that Monica had been given another another life line.
"I walked away from that show and I thought, we have to bring that girl back," he said of Sunday's Judges' Houses episode. "I thought she was going to get a chair.
"The competition wouldn’t have been the same without her," he added.
An update on the show’s official Twitter page also spread the news:
After the announcement, Monica also posted: "Hi guys! I know Halloween is upon us but this is not a trick... I AM BACK!!!! #XtraFactor #WildCard."