Christmas came early to Leicester Square when Santa's sleigh and two of his reindeer arrived on the red carpet for the Get Santa premiere.
The festive family film sees Santa locked up for trying to rescue his reindeer, who have been impounded in Battersea Dogs Home, and his freedom reliant on a small boy (Kit Connor) and his dad (Rafe Spall) getting him out.
Stars of the film, who posed with the reindeer and sleigh, told of the perfect casting of Jim Broadbent in the role of Father Christmas.
Spall said: "I think Jim is related to Santa.
"I think he's got a direct line to Father Christmas, there's something funny going on that I can't get my head around. He's the perfect Santa Claus."
Warwick Davis, who plays one of Santa's elves and goes to prison with him, said: "When I first saw Jim in his Santa outfit I became a six-year-old child again, I was looking at him with wonder in my eyes because he defines Santa so perfectly.
"Jim has played Santa on a couple of occasions previously, but I think this is the definitive version."
On portraying Father Christmas, Broadbent said: "It is fun, you get to dress up as Santa and be nice to everybody.
"You've got to get Santa right. People know what to expect with Santa. Then you can start making it your own, but first of all you need to get it right."
Get Santa also stars Broadchurch actress Jodie Whittaker as the young hero's mum and she added: "I came in for a costume fitting and said, 'Can I visit Santa on set please?'
"I thought Jim had gone all method and put on about three stone for the part, but he assured me it was all padding."
Appearing alongside them at the film's premiere were co-stars Connor, Stephen Graham, Joshua Maguire, The Saturdays' Una Foden, who provided the theme song, and director Christopher Smith.
Get Santa is released in cinemas on December 5.