Singer/actress Ashlee Simpson has stunned the music world by filing for divorce from her rocker husband Pete Wentz. Jessica Simpson's younger sister filed papers in Los Angeles County Superior Court on Wednesday (09Feb11), citing "irreconcilable differences" for the split.

The 26 year old has hired top celebrity attorney Laura Wasser to represent her as she fights for joint legal custody and primary physical custody of her two-year-old son Bronx, according to TMZ.com.

The couple wed in May 2008.

Ashlee's divorce news comes just months after Jessica Simpson announced her engagement to former American football start Eric Johnson. (MT/WNWCZM/KL)

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