Instagram/Hayden Panettiere & Milo Celebrity Hayden Panettiere reveals her shock breakup with Milo Ventimiglia was completely unexpected, leaving her deeply shaken despite no cheating or major issues. May 7, 2026 AceShowbiz - Hayden Panettiere recently opened up about the surprising end to her relationship with Milo Ventimiglia, revealing that their breakup was completely unexpected and left her deeply shaken. The actress, known for her role in I Love You, Beth Cooper, dated the This Is Us star for about two years during their time co-starring on Heroes.