Watson, who turned 18 last week and took control of her finances, features for the first time on the annual Sunday Times Rich List. The youngest of the three Harry Potter child stars, she debuts alongside her co-star Rupert Grint, now worth £7 million. They join Daniel Radcliffe, who has added to his wealth and is now worth £20 million.

Meanwhile, Amy Winehouse makes her debut in this year's Sunday Times Young Music Millionaires list with an estimated wealth of £10 million. The 24-year-old singer ranks 10th in the top 100 richest people in music in Britain aged 30 and under. X Factor chart-topper Leona Lewis is also a new entry at 14th place with an estimated £6 million fortune.

Corinne Bailey Rae, whose husband died from a suspected drugs overdose last month, and Natasha Bedingfield, are also worth £6 million. Beatle's son Dhani Harrison, the son of the late George Harrison, tops the list with the £160 million inheritance he shares with his mother, Olivia.

The highest new entry is Manchester-born fashion model Karen Elson (sixth) who shares her £25 million fortune with her White Stripes frontman husband Jack White. Katie Melua has more than doubled her wealth to £18 million, taking seventh place.

Others who remain in the list from previous years include violinist Vanessa-Mae (£32 million), Joss Stone (£12 million), Charlotte Church and Gavin Henson (£11 million), Katherine Jenkins (£9 million), and Jamie Cullum (£5 million).

The Sunday Times also publishes a list of Britain's Top 50 Music Millionaires, which sees Sir Paul McCartney valued at £500 million despite the fact that his divorce hearing to Heather Mills was told he was worth £400 million. Guy Hands, who bought EMI for £2.4 billion, is the top new entry in the Music Millionaires list with £250 million and seventh place.

Chris Blackwell, the London-born founder of Island Records, is another new entry with £100 million.