X Factor judges Gary Barlow and Nicole Scherzinger were in high spirits as they treated their remaining contestants, Rough Copy and Hannah Barrett, to a rehearsal-free evening out.
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The two mentors joined their acts on fairground rides and whizzed around on bumper cars as they soaked up the magical atmosphere at the VIP launch.
Bringing additional glamour to the event was supermodel Elle Macpherson, who was among the first to cuddle up to Father Christmas as she braved the winter chill to enjoy some family fun with her sons Flynn and Aurelius.
Cara Delevingne was her usual bubbly self as she arrived to enjoy the fun and games in Hyde Park.
After striking a pose with Santa, she took to the ice rink with fellow British models Georgia May Jagger and Suki Waterhouse, before jumping on some rides with her two friends.
Nicole and Natalie Appleton, meanwhile, were kept on their toes by their excited little ones as they navigated their way around the Wonderland, while pregnant Michelle Heaton and her husband Hugh enjoyed ambling around the park with their little girl Faith.
Handsome Homeland star Damian Lewis, Tamara Beckwith and Millie Mackintosh were also among the celebrities enjoying the festive opening.