Country singer Shania Twain, 42, and producer Robert John "Mutt" Lange [ tickets ], 59, have split after 14 years of marriage, according to published reports.

Lange--who produced mega-hits for Def Leppard and AC/DC, among others--was behind the boards for all of Twain's material that followed her 1993 debut, and collaborated with the singer on most of her biggest hits.