Article continues below advertisementNatalie Tippett, the woman rumored to be David Harbour's mistress, is defending herself against accusations made by the actor's estranged wife, Lily Allen. Tippett took to Instagram on Sunday, December 14, to address what she described as a "false narrative" surrounding the alleged affair.Article continues below advertisementSource: MEGA; @natalie_tippett/InstagramNatalie Tippett denied having a long-term affair with David Harbour.