Los Angeles , California ( CNN ) -- Christina Aguilera signed her name to a divorce petition that was filed against husband Jordan Bratman in Los Angeles County Superior Court on Thursday . The 29-year-old singer-actress cited `` irreconcilable differences '' as the cause of the split from the 33-year-old music executive she married five years ago . Aguilera 's petition said a prenuptial agreement should dictate how they separate their assets . That agreement called for Jordan to get none of the money Aguilera earned before , during or after their marriage . She is asking the judge to grant joint legal and physical custody of the couple 's 2-year-old son , Max . `` Although Jordan and I are separated , our commitment to our son Max remains as strong as ever , '' Aguilera said in a statement released Tuesday through her representative . Aguilera co-stars with Cher in `` Burlesque , '' a major feature film set for a Thanksgiving release .
Aguilera wants joint custody of her son . The singer-actress filed for divorce Thursday . Her petition says the couple had a prenuptial agreement .