At age 10, Cecilia Cassini is already an established fashion designer for kids. Cecilia Cassini, from California, began her career as fashion designer, when she was just 5 years old. She cut up her sister’s dress, and adjusted it to her own design. For her 6th birthday, she received a sewing machine and began taking sewing lessons. Cassini has her own manager, no other than Pilar DeMann, the woman behind the Kardashians’ rise to power.