Before filing to divorce disgraced actorArmie Hammer last summer, Elizabeth Chambers allegedly found evidence that he had an affair with a co-star, according to a new exposé by Vanity Fair. 

In February, a source close to Chambers told E! News that Hammer first told her a couple years ago that he was unfaithful and admitted it was not a one-time thing. The insider said he was apologetic and they started couples therapy to try to save their marriage of 10 years.