LOS ANGELES (Reuters) — 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 fiance, 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 has been working on her debut album for the past few years.