The New York Times reports that despite a fortune ranging from $50 million to $125 million, the battle for mentally unstable Britney Spears's money is raging. She's a shrewd business person -- generating cash from royalties, concerts, clothing, perfume, corporate promotions and real estate.

But she's also spending a lot of that money. She takes in $720,000 a month but mainly from royalties, but earns "only" $13,000 a month from investments. Her spending includes $102,000 a month for entertainment, gifts and vacation and $16,000 for clothes. Yet court documents reveal that members of Britney's household have been paying for her medicine, food, and other day-to-day needs.

While Britney makes some money from her albums -- she received a $4 million advance on her latest Blackout -- the real money is in concerts and the clothing and other items sold there. Her five major tours have sold some $140 million in tickets but her take -- after deducting costs for arena rentals, equipment, crew and all those backup dancers -- is much smaller. The real money is made from the sale of T-shirts, key chains, dolls and other Britney-branded goods.