Prince William and Kate Middleton still receive a hefty allowance from Prince Charles

Prince William and Kate Middleton may be 33-years-old and have two children, but they're still on the royal payroll, along with 30-year-old Prince Harry and Prince Charles' 67-year-old wife, Camilla Parker Bowles.

To help cover the costs of official royal activities, Prince Charles doles out around $4.667 million (£2.965 million) to his offspring and wife each year, according to a recent Annual Review released by Clarence House.

"The future king, 66, pays for his official life by drawing an income from the Duchy of Cornwall, a massive estate given to the heir to the throne to fund his official and private livelihoods," reports People magazine. "That income in the year to March 31 was $31.1 million, a rise of 1.7 percent."

While specific expenditures are not detailed, the annual funds are used to cover things like travel and wardrobe. But according to People, William and Kate independently pay for their country home and personal staff, including a nanny.