 Hilton earned about US$2 million between 2003 and 2004, US$6.5 million between 2004 and 2005, and US$7 million between 2005 and 2006.In December 2007, Hilton's grandfather Barron Hilton pledged 97 percent of his estate (the Hilton family fortune) to a charitable organization founded by her great-grandfather Conrad Hilton