by Natasha JokicBuzzFeedBuzzFeed StaffI'm a Senior Staff Writer at BuzzFeed covering pop culture, entertainment, and politics. Warning: Discussion of mental health and substance abuse. Hayden Panettiere discussed giving up custody of her daughter, Kaya. Dimitrios Kambouris / Getty Images Hayden welcomed her daughter in 2014 with then-fiancé Wladimir Klitschko. In 2018, after the couple split, Kaya went to live in Europe with her father, as Hayden was struggling with mental illness and addiction.