Prince Harry 's ex-girlfriend Cressida Bonas has opened up with a tear-jerking tribute to her late half-sister, Pandora Cooper Key. The actress, who famously dated Prince Harry from 2012 to 2014, introduced by their mutual friend Princess Eugenie, is grieving the loss of Pandora who died in July after battling Li-Fraumeni syndrome. This rare genetic disorder greatly heightens the risk of developing several cancer types. As a new mum to a baby boy, Cressida has felt the absence of her sister