Lady Alice St Clair-Erskine (born 1989), also known by her stage name Alice St Clair, is an English actress known for playing Kate Middleton in William & Catherine: A Royal Romance and Flora Marshall in The Crimson Field. St Clair was born in 1989, the eldest daughter of Peter St Clair-Erskine, 7th Earl of Rosslyn and Helen Watters. She was educated at Heathfield St Mary's School and Bedales Scho... show more