A number of famous faces are entering the iconic tent in support of Stand Up To Cancer, raising money to help fund vital cancer research.
In each episode four celebrities will be welcomed by The Great British Bake Off hosts Sandi Toksvig and Noel Fielding.
They'll face a trio of baking challenges hoping to impress Bake Off judges Paul Hollywood and Prue Leith with their baking skills.
At the end, Paul and Prue will decide the best baker who will walk away with a much sought-after Star Baker apron.
The celebrities taking part in the The Great British Bake Off's Celebrity specials this year include Hollywood star John Lithgow, comedian Jon Richardson, Paralympian Hannah Cockroft, and outrageous funnyman Russell Brand. Winner.
Joining them are Quirky funnyman James Acaster, stage and screen actor Russell Tovey, TV presenter Rylan Clark-Neal, actress Michelle Keegan, Comedian Johnny Vegas, grime artist Big Narstie, Olympian Katarina Johnson-Thompson, and Labour MP Jess Phillips.
Completing the cast are Broadcaster, author and journalist Jeremy Paxman; award-winning comedian Joe Wilkinson; actress Sally Lindsay; and reality star, presenter Georgia Toffolo, aActor Greg Wise, broadcaster and journalist Krishnan Guru-Murthy, TV presenter Caroline Flack and Olympic boxer Nicola Adams.
Watch The Great Celebrity Bake Off online
You can watch episodes of The Great British Bake Off online and catch up via Channel 4's All4 Player here.
As well as watching this year's shows, you can catch up on 2018's celebrity specials.
Celebs who took part in last year's series included comedian Harry Hill, Spandau Ballet's Martin Kemp, actor and writer Roisin Conaty, veteran broadcaster Bill Turnbull, Countdown's Nick Hewer, singer and TV personality Stacey Solomon, The Kaiser Chiefs' Ricky Wilson and dance troupe Diversity's Perri Kiely.
Meanwhile, you can watch past series of The Great British Bake Off online on Amazon and iTunes.
Single episodes cost £2.49 while entire series can be purchased from £9.99 to £18.99. You can also purchase episodes of Bake Off's Celebrity specials as well as spin-off show An Extra Slice.
Following The Great British Bake Off new Celebrity specials, the main series of Bake Off will air later in 2019.