United Kingdom, March 7 -- Princess Diana's brother Charles Spencer lost his virginity to a prostitute on a family vacation when he was 12 years old.

The 9th Earl Spencer, now 59, makes the revelation in his new memoir 'A Very Private School', saying he was on a trip to Italy with his mum and stepdad when he saw a "short-skirted sex worker standing on a corner" and used his pocket money to pay the woman £15 for his first time having sex.

He admitted the experience left him feeling "hollow and cold," and he was not intimate with another woman until he was 17, according to extracts from his book revealed by The Sun.

Also in his autobiography, Charles claimed to have been sexually abused by a female nurse assistant at his boarding sc...