Justine Hemmes and model girlfriend Madeline Holtznagel put on a loved-up display at event in Sydney

Justin Hemmes' model girlfriend Madeline Holtznagel looks very merry as she sips Champagne at party

Simone and Madeline Holtznagel risk wardrobe malfunctions at Charlotte Tilbury event in Sydney

Justin Hemmes, 50, can't keep his hands off his girlfriend Madeline Holtznagel, 27, at Cartier event