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For the debut episode, the celebrities recreate the classic millionaire shortbread, attempt a tricky fruit tart and create their pet hates in cake form in the ultimate showstopper.
Previous seasons of the charity special have contained five episodes, so this season is expected to last five weeks.
With 20 contestants signed up to take part, fans are correct to presume four will be competing against each other each time.
With this in mind, the 2021 series is due to come to an end on April 6, just in time for Easter.
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The official Twitter account for the Bake Off teased the launch of the new series, saying: "Raising dough for a great cause. The Great Stand Up To Cancer Bake Off. Coming very soon to a screen near you."