Jessica and Ashlee Simpson fear their parents’ marriage is in ruins, after their dad Joe left his wedding ring at home for a night out.

Joe and his wife of 29 years, Tina, haven’t been seen in public together for weeks, amid rumours their daughters’ fame has driven a wedge between them.

Gossip was fuelled when former pastor Joe appeared at the South by South West festival in Austin, Texas earlier this month with a group of women and no wedding band.

A source tells the National Enquirer, "(They are) definitely living separate lives. Joe spends less time at their home in Encino than ever before, and he just turned 50.

"Joe and Tina still reside in the same home, but there’s definitely trouble in the marriage, and much of it stems from Tina being upset that Joe is more involved in handling the careers of Jessica and Ashlee."

Representatives for the stars were unavailable for comment as WENN went to press.