John, from coach Will.i.am's team, was knocked out during Saturday night's programme after losing out in the public vote.
We reported earlier today that the final two contestants will perform one last song, and the victor will then go on to release the track at the end of tonight's show.
Following Jamie's exit, Mo competed against Into The Ark, singing Unsteady by X Ambassadors.
Into The Ark served up an impressive rendition of Not A One by The Young Wild in a bid to secure the coveted Polydor recording contract.
Jones couldn't hide his surprise when it was announced that his act, Into the Ark - Taylor Jones and Dane Lloyd - had made it to the final two.
But it was Mo that came out on top, as host Emma Willis announced he had won the show.
Jamie (Team Jennifer Hudson) took on Ed Sheeran's "Shape Of You", Into The Ark (Team Tom Jones) performed "Hold On, We're Going Home" by Drake, whilst Mo (Team Jennifer Hudson) sang Paolo Nutini's "Iron Sky".
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The coaches were even confused by the antics unfolding on stage, with will.i.am tweeting: "What was that?' and 'That's how you get out of a mistake".
The singer continued: "If they don't ask me back then a bit like when my acts went out, I would wonder what I did wrong".
As Jamie have finished in third place, it does mean he won't go on to perform the final song of the series.
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Gavin was "disappointed" when his remaining acts, Max Vickers and Truly Ford, left the show in last weekend's semi-final, and admitted he questioned whether it was down to his own choices.
In a new move by the show, Mo will now head straight into the studio and record a winner's EP, which will be released in a few weeks time.
However, Sir Tom says he already is in talks. No official winner's single will be released.