LONDON -- Some images just stay with you.
Princess Diana's slicked back short hair; Tilda Swinton channelling David Bowie; Kate Moss' effortlessly messed up tresses -- these are Shaved | Adult Movies Onlinesome of the most iconic images to grace our magazines in recent years.
SEE ALSO: Princess Diana-inspired ASOS collection is the ultimate style tributeBut who are the unsung heroes behind these images that have defined a generation?
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Sam McKnight -- the hairstylist behind some of the most iconic images in fashion and pop culture for the past four decades -- is one such hero.
He's worked with icons past and present, from Madonna to Lady Gaga, and shot over 100 Vogue covers.
In 1990 Sam McKnight first cut Princess Diana's hair short, after meeting her on a shoot with her then sister-in-law, Victoria, Viscountess Althorp.
A new exhibition celebrating McKnight's 40-year career opens this week in London, tracing his work from the late 1970s to the present.
Original image has been replaced. Credit: Mashable 
Original image has been replaced. Credit: Mashable McKnight is one of the first hair stylists to have built a career solely in the fashion industry, having made a name for himself working on fashion editorial shoots, advertising campaigns and catwalk shows.
The major exhibition will pay tribute to his integral role in the fashion industry, and his contribution to shaping the images of Kate Moss, Naomi Campbell, Princess Diana, Linda Evangelista and Christy Turlington.
Original image has been replaced. Credit: Mashable The exhibition will explore the creative process behind hair styling in the fashion industry, and reveal the relationships between McKnight and his key collaborators, including the likes of Kate Moss, Christy Turlington and designer Karl Lagerfeld.
Pieces from McKnight's extensive 40-year archive will feature including: photography, magazines, catwalk and backstage footage, private photographs, full outfit looks and commissioned wigs and hairpieces.
Original image has been replaced. Credit: Mashable Interestingly, the exhibition will take the form of a visual timeline of changing styles from the 1970s to the present day.
Hair by Sam McKnightopens on 2 November at Embankment Galleries, Somerset House in London. Tickets are £12.50 ($15.20). The exhibition will run until 12 March.