Ashlee Simpson (Reuters files)

Ashlee Simpson’s marriage to rocker Pete Wentz is officially over - the couple's divorce was finalized last month.

The pop star moved to end their three-year union in February and a Los Angeles County Superior Court judge signed off on the legal petition on 22 November - two days after their son, Bronx, turned three.

Details of the former couple's settlement and childcare arrangements for the tot have been kept under wraps, although Simpson had initially requested primary physical custody, while the Fall Out Boy bassist had asked for joint custody, reports TMZ.com.

Jessica Simpson's younger sister has since moved on to date Boardwalk Empire actor Vincent Piazza, while Wentz went public with his new romance with supermodel girlfriend Meagan Camper in September.