Miley Cyrus to be a billionaire

In this image released by Disney, Miley Cyrus from the Disney Channel's 'Hannah Montana' poses with Disney characters Mickey Mouse and Minnie Mouse at the Magic Kingdom at Walt Disney World Resort in Lake Buena Vista, Fla., on Thursday, May 1, 2008. [Agencies]

Mum Tish Cyrus added: "A lot goes into her investment fund, which she can't touch until she's 18."

The singer/actress completed a 69-date tour last year, with her 3-D film Hannah Montana & Miley Cyrus: Best of Both Worlds Concert Tour taking around £14 million in its opening weekend. She has also agreed a seven-figure deal to write her autobiography.

Other young stars on the rich list include band the Jonas Brothers and actresses Dakota Fanning, 14, and Abigail Breslin, 12.