Britain's Got Talent judge Alesha unveiled the grand design at St Pancras International, and the tree was brought to life with snow falling for the first time inside the station.
Doesn't it look amazing?
Instead of traditionally having a star or angel on top of the tree, a metre-high Mickey Mouse takes its place.
The snowflakes magically fall every four minutes from the top of the tree and will dissolve as they reach the ground without leaving a trace.
The tree takes place on the concourse at St Pancras until 4 January 2016. At 14 metres tall, it's created from over 2,000 soft toys of children's favourite Disney characters from the big screen and TV.
Mum-of-one Alesha, who is set to join Disney Junior next year as a guest star in Doc McStuffins, said: "I am so excited to add the last toy to the magical Disney Junior Christmas tree. I picked Doc McStuffins, from my daughter's favourite Disney show and can't wait to bring her to see the tree and falling snow inside the station.
"What better way to launch the festive season than unveiling this unique and enchanting Disney Christmas tree. It's such a special time of year and I would encourage families to come down and share in the magic of Christmas at St Pancras!"
It's bound to bring some joy and magic to busy commuters!
Alesha Dixon's episode of Doc McStuffins airs on Disney Junior in early 2016
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See the tree in action below: