The X Factor judge, 57, was pictured at the festive fairground's launch on Thursday night alongside girlfriend Lauren Silverman and their super cute son Eric, two.
Little Eric was all bundled up against the cold as he held onto his famous dad with one hand and clutched a panda teddy bear with the other.
The family were seen enjoying the dodgems and trying out some of the kid-friendly rides, before Simon had a go on the shooting booth. Perhaps he won Eric's panda bear from there?!
For Simon, it was a night off before the next round of X Factor live shows on Saturday, which is Movie Week. He only has one act left in the competition, Emily Middlemas, after teenager Sam Lavery was sent home last week.
Before leaving the show, Sam told us she was totally smitten with little Eric, who often accompanies his dad to X Factor rehearsals, wearing his own little pair of headphones.
"Eric is literally my favourite person," she said. "He comes and sees me and we have in-depth conversations about Peppa Pig. I have a tiger ring I wear every weekend on the show and me and Eric call it 'Tim the tiger'. It's our good luck charm. We have our own secret handshake, too.
"He's the coolest little boy. I asked him where his daddy was the other day and he said (puts on a well-spoken accent), 'Oh, he's in his dressing room.' He's so posh, I love him."
Meanwhile, former X Factor judge Nick Grimshaw and X Factor host Caroline Flack were also at the Winter Wonderland launch: they both appeared on last year's show but left after just one year.
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