Mad Men star Jon Hamm has been treated for alcohol addiction, it has emerged. The 43-year-old actor, who has completed the treatment, had the support of his long-time partner, actress and film-maker Jennifer Westfeldt, in his struggle, his publicist Annett Wolf said. The couple had asked for privacy and sensitivity, a statement said, and no further details were provided. The disclosure, first reported by TMZ, came as the final season of the 1960s TV drama begins on April 5 on AMC.