[2][3][4] From as young as the age of four,[2] Hennink expressed an interest in fashion and began working as a model after she turned sixteen, having been discovered by a magazine editor in her native Amsterdam.
[3] Amongst the many magazines that Hennink has been featured in are various international editions of Vogue, as well as other publications such as Elle, Glamour, Time, Vanity Fair, Marie Claire, L'Officiel, Harpers & Queen and Photo.
Hennink went on to walk the runway for many other designers[4][7] including Versace, Christian Lacroix, Valentino, Christian Dior, Gianfranco Ferré, Oscar de la Renta, Calvin Klein, Issey Miyake, Moschino, Claude Montana, Salvatore Ferragamo, Comme des Garçons, Lanvin, Thierry Mugler, Donna Karan, Trussardi, Mila Schön, Rifat Özbek, and Bruce Oldfield.
[2][5] In 1993, after the publication of the book “Marpessa, uno sguardo”, by Ferdinando Scianna, Hennink retired from modeling, having also been put off by the arrival of the grunge fashion trend.
[9] In January 2011, Hennink was chosen to walk in a special fashion show held by designer Alberta Ferretti in Florence, Italy.