She doesn't carry the habitual front-row "accessory" - a bottle of l'eau minerale. "I don't like water. I drink Diet Coke." Nor does she smoke, or drink alcohol or even sip a cafe.
The rhetorical question matches Alt's drole, self-deprecating sense of humour. Smart? She has it sewn up, and is as sharp as the razor-heels on her favourite Giuseppe Zanotti ankle boots.
Alt, 43, has epitomised rock 'n' roll style reborn for the last decade. She is as far-removed from the groomed, coiffed, manicured and maquillaged image of The Devil Wears Prada as Venus from Mars - although her son Antonin, 14, subscribes to American Vogue editor-in-chief Anna Wintour's love of tennis and could probably take her to match point.
Alt is rarely seen in a skirt. Her "uniform" is skinny jeans, from J. Brand, Acne or, her favourite, Topshop - "they have the best".
She wears them with T-shirts, cashmere sweaters from Ralph Lauren or Prada, a Balmain jacket, a vintage fur, and those spike-heeled boots. Nonchalant, cool chic is the Alt attitude.
She inherited her fashion savvy, as well as her height, gazelle-legs and camera-ready looks from her mother Francoise, a Lanvin and Nina Ricci model in the 1960s and 1970s.
"When she stopped modelling, we would go to fashion shows together. My first was Jean Paul Gaultier when I was 19. It was crazy. I loved it."