Iconic model Pat Cleveland has spawned a family business in sashaying catwalks. Her daughter, Anna, was a model in Stephen Burrows’ runway show Thursday at the Audi Forum in Midtown. Anna strutted with her mother’s trademark free spirit, with exaggerated turns and a show of her long gams as she walked in a striped gown with split sides. Thursday also marked the legendary Burrows’ 68th birthday and his 45th year in the fashion industry.