Britney Spears has invested her fortune in some of her favourite fast food brands, including Coca-Cola and McDonald's. Details of the singer's financial affairs have been revealed in paperwork filed as part of her conservatorship case last year (12) and obtained by E! News. The paperwork reveals the Toxic star's fortune has been invested in companies such as Coca-Cola and McDonald's, as well as Chipotle and Kraft Foods. Other brands she has invested in include Amazon, Google, Visa, Colgate, Estee Lauder, and Facebook. Spears' net annual income is listed as $13.9 million (£9.3 million). Her earnings are set to be given a major boost after she recently signed a huge deal for a Las Vegas residency for $15 million (£10 million) per year.