In true Albert Square style, the festive cheer is set to be "shattered" when she finds out her husband Alfie is the father of her cousin Hayley's baby daughter.
Releasing a tantalising new photo tonight, an Enders spokesperson explained: "Alfie is determined to give Kat the perfect Christmas.
"But his dreams come to a sudden halt when the truth about him and Hayley unravels in catastrophic style.
"As Kat’s world is shattered into pieces, chaos ensues with consequences no one can see coming."
The Sun revealed the shocking Christmas awaiting the leopardprint-clad Square legend last week – but there is yet more misery to come.
A violent incident in Walford will have serious consequences for the good folk of Albert Square and ripple through the New Year.
An EastEnders spokeswoman teased: "Christmas is rarely a quiet time in Albert Square and this year is no exception when at least one person is left with blood on their hands.
The spokeswoman also teased Mick Carter's release from prison and his violent revenge on evil Stuart Highway.
They said: "Mick Carter is finally reunited with his beloved Linda but with revenge on his mind, Christmas will be anything but peaceful for the Carters."
And New Year will be as equally explosive as Mel Owen puts the final touches to her plan for ex-husband Ray Kelly and risks her own life to take him down.
As always, it might be a total misery-fest – but festive EastEnders is going to be unmissable telly.
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