The line up includes musical legends like Elton John, pop songstress Kylie Minogue, the biggest band in the world, One Direction, Ricky Martin, The Corrs, Josh Groban, Little Mix, and The Killers front man Brandon Flowers.
As well as Jack himself, comedy comes from Chris Ramsey, Romesh Rangathan and Matt Forde.
Britain's Got Talent winners Jules, Matisse and Friends will claim their prize by performing on stage, there's acrobatics from Cirque Du Soleil, and numbers from West End shows Cats and Mary Poppins to look forward to as well as much much more.
The Royal Variety Performance, ITV, 7.30pm
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