Carey Mulligan and her husband Marcus Mumford have broken into the under-30s list with a joint fortune of £13 million

Former Harry Potter star Emma Watson, 24, has also seen her financial worth burgeon in the past year to £30 million, making her Britain's 20th richest person under 30.

Her flourishing Hollywood career, with roles in epic drama Noah and comedy This Is The End (co-starring James Franco and Seth Rogen), has added £3 million to her capital in the past year alone.

"She graduates from Brown University this month, having successfully juggled student life with being an A-list actress and modelling in campaigns for Lancôme, Burberry and Chanel," the Sunday Times said. "Vanity Fair estimated her wealth at £20m in its 2009 list of the 40 highest-paid Hollywood stars. Allowing for her limited spending (most of her earnings go into a trust fund), we nudge the actress up to £30m."

The Great Gatsby star Carey Mulligan, 28, and her musician husband Marcus Mumford 27, made an appearance in the under-30s list for the first time, with a joint fortune of £13 million.

As far as the establishment goes, the Queen has also had a good year of it, adding £10 million to her personal fortune - which now stands at £330 million.

Number of women on rich list up 50% in past decade