Marella Agnelli, born Princess Donna Marella Caracciolo di Castagneto, is an Italian art collector, socialite, style icon and widow of Fiat tycoon, Gianni Agnelli († 2003). The Agnelli mansion at Villar Perosa is one of the traditional summer residences of the family, they acquired the estate in 1853, long before FIAT was established.
Donna Marella Agnelli