Hannigan married her Buffy the Vampire Slayer and Angel co-star Alexis Denisof at Two Bunch Palms Resort in Desert Hot Springs, California, on October 11, 2003.
Hannigan menikahi rekan aktornya di Buffy the Vampire Slayer, Alexis Denisof, di Two Bunch Palms Resort, Desert Hot Springs, California, pada tanggal 11 Oktober 2003.