Designed by Briana Gagnier.
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Christie Brinkley, actress and model best known for her roll in National Lampoon's Vacation, is sizing down and moving up (to the Big Apple, that is). According to Variety, she's traded not one, but two Hamptons estates for a TriBeCa glass-walled duplex penthouse, which she's recently rented. 

The Sag Harbor area residences are each listed for over $20 million, complete with gorgeous features such as a greenhouse, pools, ponds, and more. Read ahead for a peek inside Brinkley's former Hamptons homes, and her latest city upgrade.