Pop star Ashlee Simpson has lost her dream job as Meryl Streep's on-screen daughter because of her hectic recording schedule.

The singer was hoping to land a part opposite Streep in the movie adaptation of hit Abba musical Mamma Mia!, but had to abandon plans because she is "too busy".

A representative for Simpson tells In Touch magazine, "She was interested in the role, but unfortunately, it didn't work out because she's putting out an album."

Simpson already has experience in musical theatre - she starred in a London production of Chicago last year.