The former supermodel is the new face – and body – of the luxury brand's underwear range, showing off the incredible body that made her famous in a series of black and white ads.
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The mother-of-two looks nowhere near her 44 years as she poses for the sizzling shots, photographed by Mario Sorrenti.
Christy has a longstanding relationship with Calvin Klein. She made her catwalk debut for the designer in 1987 runway show before shooting an iconic campaign for him with Irving Pen in 1988.
Christy replaces Lara Stone, who recently gave birth to her first child with David Walliams.
Speaking to Elle magazine on the shoot, Christy said it was "nice to be back" in the Calvin Klein fold.
"After so many years, it's nice to be back in the Calvin Klein world," she said. "The most memorable campaign I shot for Calvin Klein was probably either an Eternity fragrance campaign, which I did also in 1988, or a Steven Meisel underwear campaign that I did in the mid to late '90s.
"There are so many though. They are still some of the images that I like most out of all the images from my career, so I'm quite proud of them."
Calvin Klein first announced in May that Christy would star in the brand's underwear campaign.
It was shot on location in Vieques, Puerto Rico.
The fall media campaign will be comprised of a mix of print, digital and outdoor advertising timed to coincide with September magazine issues, Calvin Klein said. Creative direction for the campaign was led by the company’s in-house global marketing and advertising agency.
The first billboards for the campaign will be installed Aug. 19 at New York’s Houston and Lafayette streets and on Sunset Boulevard in Los Angeles.