Sexy Christy Turlington Calvin Klein underwear model billboard...

Christy Turlington became a major supermodel following her 1988 ad campaign for Calvin Klein and now 25 years later the 44-year-old mother of two is back with another iconic black and white advertising campaign for the fashion brand, proving she's still got it.

This billboard featuring the stunning, shimmering model in black underwear for Calvin Klein's Fall/Winter 2013 underwear collection will certainly get heads turning as motorists drive by and the few people who walk in L.A. pass by at street level.

If you like the sultry billboard ad, be sure to check out the accompanying video featuring the American model showing off more of her famous figure.

This provocative lingerie billboard was spied along Sunset Boulevard opposite L.A.'s notorious Chateau Marmont Hotel on August 21, 2013.

Plus if you like this ad creative, be sure to also check out these previous equally sizzling Calvin Klein underwear billboards starring Eva Mendes from 2009.

Interestingly last year German supermodel Claudia Schiffer returned to model for the 30 years of Guess celebrations (with more clothes on though), following her iconic 90's ad campaigns for the fashion brand.