Penelope Tree (born 1950) is an Anglo-American former fashion model prominent in swinging sixties London. She was the only child of Marietta Peabody Tree, a socialite and Democratic political activist, and Ronald Tree, a bisexual journalist, investor and MP. Tree is a great-granddaughter of American retailer Marshall Field and of American educator Rev. Endicott Peabody. Tree's family objected to her career as a model, and when she was first photographed at the age of 13 by Diane Arbus, her father vowed he would sue if the pictures were published.