Apparently Britney Spears spends as much as she makes.  According to TMZ.com, from the $11,5 Million she made last year, her dad spent conservatorship reported $10 Million in expenses:

“From March to December Brit blew $447,633.69 on security alone. Six months of household repairs and maintenance ran her $49,387.22.
Britney also spent $625,000 to pay Kevin Federline’s lawyers, as ordered by the courts. In the docs, the payments are referred to as “Federline Fees.”
K-Fed ain’t doin too bad either — from March to December, Britney kicked over $178,818.00 in child support payments.
Grand total expenses for Brit between Feb. and December — $10,116,678.23.”

I guess being rich and staying rich is too different things…