The two-year-old perched on her father David Beckham's knee at the New York Fashion Week event, reported Digital Spy.
Her presence at the spring-summer 14 showcase even made Vogue editor Anna Wintour, who was sitting next to her, crack a smile.
Victoria uploaded a picture of her daughter at the show to her Twitter page, adding, "All eyes on Baby Harper at SS14 Victoria Beckham NYFW."
Victoria also shared a photograph of herself, looking dressed down in sneakers and jeans, sitting with her husband and daughter for a rehearsal before the big event.