Princess Augusta of Prussia (b. 15 Dec. 1986), 3rd child of Prince Frederick Nicholas of Prussia. Can't find much info on Princess Augusta. This may be a debutante photo but I'm not sure. Anyhoo, this is a very pretty pic of the British-born German royal.
Wedding Wednesday: The Royal wedding dresses through the ages
Lady Sarah Armstrong-Jones, the only daughter of Princess Margaret and Antony Armstrong-Jones, married Daniel Chatto, an actor, on July 14, 1994. Lady Sarah’s wedding gown was designed by Jasper Conran. Sarah’s veil was anchored with the Snowdon Floral Tiara, a gift to Princess Margaret from her husband. Sarah has two sons, Samuel born in 1996, and Arthur born in 1999. She maintains a close relationship with her aunt, Queen Elizabeth II, and is invited to Royal events.
Lady Penelope Mountbatten wearing the Milford Haven Tiara, United Kingdom (1890; made by Bolin; rubies, diamonds, gold). Made for Grand Duchess Sophie, wife of Grand Duke Michael Mikhailovich. Inherited by Nadejda Mountbatten, Marchioness of Milford Haven.