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Tyra Banks baffled fans and aroused some concerns during an on-stage appearance Sunday in Sydney, Australia ... ranting about Santa Claus trying to sabotage her brand.

The supermodel, TV host, and businesswoman reportedly DJ'd a set at a local pub when she launched into a tirade accusing Kris Kringle of counterfeiting her SMiZE & DREAM ice cream.

Donning a knee-length yellow Santa hat, long canary-yellow wig, and skintight black dress, Tyra went off ... claiming Santa is lying about his intentions with the snacks we traditionally leave out for him.

In a video shared on socials, she insisted, "Child, he ain't biting that cookie. He ain't sipping that cream. He taking a bowl from your cabinet ... and he putting a little bit of cookie, and he putting a little bit of th

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