The trio are hoping to impress judges Paul Hollywood and Dame Prue Leith during a final round of signature, technical and showstopper tasks.
Last week saw three-time star baker Jurgen eliminated from the series in a move that shocked viewers.
The German physicist was considered a favourite to win the show outright but failed to impress during the patisserie-themed semi-final.
Sales manager Chigs, 40, from Leicester, only began baking regularly during the first national lockdown of 2020.
Italian amateur baker Giuseppe, 45, is a chief engineer and lives in Bristol with his wife and their three young sons.
London-based client relationship manage Crystelle, meanwhile, began baking seriously three years ago.
The 26-year-old enjoys fusing spices from the places she has visited into her bakes.
It comes after Bake Off extended its licence with Channel 4 and Love Productions for a further three years until 2024.
The Great British Bake Off has extended its licence with Channel 4 and Love Productions for a further three years until 2024.
The popular baking show has been broadcast on Channel 4 since 2017 after it bought over the rights from the BBC, who previously aired the show for the first seven series.
The programme is on its twelfth series and is fronted by judges Paul Hollywood and Dame Prue Leith, with Matt Lucas and Noel Fielding as the presenters in the famous tent.
The agreement also includes the spin-off programmes Bake Off: An Extra Slice, Junior Bake Off, Bake Off: The Professionals, The Great Celebrity Bake Off for Stand Up To Cancer and The Great Pottery Throw Down.
The multi-award-winning programme is one of the biggest shows for Channel 4, with last year’s final watched by 11.5 million people, more than a 40% share of the viewing audience, according to the broadcaster.
The current series is averaging more than eight million viewers per episode, making it the second most watched unscripted show of the year after Strictly Come Dancing.
It has also had the biggest first run for an unscripted series on the broadcaster’s on demand service All 4 this year.
This news comes amid discussions surrounding the potential privatisation of Channel 4, which is publicly owned and receives its funding from advertising.
Ian Katz, chief content officer at Channel 4, said: “We are thrilled that Channel 4 will continue to serve up Bake Off’s unique combination of warmth, humour and soggy bottoms for years to come.