Britney Spears is worth an estimated US$100 million ($140 million).
The singer's enormous wealth was revealed in leaked documents drawn up by the legal team who prepared her premarital agreement with estranged husband Kevin Federline.
Britney, who has agreed to give Kevin US$10 million in their divorce settlement,has made US$26.5 million from her music career alone.
Lea Goldman, the associate editor of business bible Forbes magazine, said: "She is a very wealthy woman and protected by an ironclad prenuptial agreement."
Her contract with Zomba Records earned her US$6.72 million for her last album Into the Zone and the accompanying 2004 tour netted her an estimated US$20 million.
Music royalties from films and adverts make Britney around US$60,000 a year.
She also has an estimated US$33.25 million in six high-interest bank accounts.
Her endorsement deals have earned her US$21.6 million, including the record-breaking US$9.27 million Pepsi deal she signed in 2001.
The Toxic singer also has deals with Samsung, Toyota, Kirin, Proactiv, Skechers and Nabisco.
Britney's 2004 deal with Elizabeth Arden earns her royalties on best-selling signature fragrance Curious, plus a skin-care and cosmetics line, amounting to US$16.7 million. She is guaranteed to annually earn between US$1.96 million and US$2.94 million until 2009 from the deal.
Britney owns four homes, including properties in Malibu and Orlando, plus a vast Louisiana forest – the total worth of which is around US$22.6 million.
The 25-year-old has also earned US$6.5 million from her TV appearances, plus magazine and film deals - including US$3 million for her role in Crossroads.
Britney, who checked out of Malibu's Promises rehab centre this week, has been advised to try and revive her music career as soon as possible.
Executive editor of Rolling Stone magazine Joe Levy said: "The best thing Britney can do right now is take some time away for herself and make a great record.
"The old saying is that she's just one hit away from a comeback. Side by side is the saying that there's no such thing as bad publicity."
Forbes magazine recently ranked Britney as the 12th richest woman in entertainment.
