Princess Diana received a £50,000 flat in London as a coming-of-age present from her parents on her 18th birthday in July 1979, and Zoopla reports it is now worth an estimated £2.29million. The home was situated inside of Coleherne Court, a mansion block in Knightsbridge, and featured three bedrooms which she shared with her friends Carolyn Bartholomew, Sophie Kimball and Philippa Coaker.