Kay Cohen (born Kathleen Siddall on 31 December 1952 in Levin, New Zealand) is an Australian fashion designer and business woman based in Sydney, Australia. Cohen has led a number of lingerie design brands, most notably as Founder and Creative Director of Pleasure State and as General Manager and Creative Director of Elle Macpherson's Lingerie label Elle Macpherson Intimates, also Cohen is known as the inventor of the Biofit uplift bra.