Lisa Marie Presley, the twice-married daughter of the King of Rock 'n' Roll, can't help falling out of love. Presley, 33, the sole heir to Elvis Presley's fortune, has split with her rock musician fiancé, John Oszajca, but they remain ``very good friends,'' her publicist said Thursday. Paul Bloch of PR firm Rogers & Cowan said he did not know the reason for the split, and added that Presley was not dating anyone at present. Presley, who has been working on her debut album for the past few years, met Oszajca in May 1999. They got engaged that Christmas after he sought permission from Lisa Marie's mother, Priscilla Presley. Lisa Marie Presley walked down the aisle for the first time in 1988 with musician Danny Keough. They had two children before splitting in 1994. That same year, she married self-proclaimed ``King of Pop'' Michael Jackson in a secret ceremony. She filed for divorce in January 1996.