SIGNING ON: Kirstie Clements’ “The Vogue Factor” memoir on her 25 year career at Vogue Australia, 13 of them as editor, may have been a best-seller in Australia and the UK, but she’s hoping her next runaway hit could be one of her children. Sam Ayat, the 6’3” 19-year-old son of Clements and Mourad Ayat, has just been signed by Australia’s Chadwick Models, after his mother approached the agency and he could be the next Australian face to debut at the kickoff of the fall 2015 men’s wear season in London in January. With highly successful international modelling careers carved out by Australian women and more recently by a growing roster of Aussie men, agents, scouts and casting directors are constantly on the lookout for the next big thing Down Under. No chance apparently of another antipodian double act, however, à la identical twin Sydney footballers-turned-models Jordan and Zac Stenmark, who have worked for Abercrombie & Fitch, Calvin Klein and Mugler. Ayat’s identical twin brother Joseph has no interest in modelling for the time being.