Christie Brinkley, 68, looks astonishingly youthful in skinny jeans

Christie Brinkley looked youthful in her skinny jeans on Monday.

The 68-year-old Vacation actress was dressed for fall with a plaid jacket over a yellow sweater as she walked to a vintage red-and-white truck outside her Hamptons, New York home.

'Keep on Trucking,' the model wrote in her caption. 'But remember what this season , understanding, helping, togetherness.'

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