I december 2007, blev det kendt, at hun nu var kæreste med sin ''Heroes''-medskuespiller Milo Ventimiglia <ref>{{cite web |url=http://www.people.com/people/article/0,,20168512,00.html |title=Milo Ventimiglia & Hayden Panettiere Are an Item |access-date=2008-01-04 |author1=Garcia |author2= Jennifer |author3= Stephen M. Silverman |date=2007-12-31 |publisher=[[People (magazine)|People]]}}</ref><ref>{{cite web |url=http://www.foxnews.com/story/0,2933,319665,00.html |title=Report: Hayden Panettiere, 'Heroes' Co-Star Milo Ventimiglia Dating |access-date=2008-01-04 |date=2008-01-02 |publisher=[[Fox News]]}}</ref>, selvom Panettiere havde benægtet dette i et interview med bladet ''GQ'' <ref>{{Cite web |title=MOTY: OBSESSION OF THE YEAR |url=http://men.style.com/gq/features/full?id=content_6202 |publisher=[[GQ]] |date=2007-12 |access-date=2008-02-05}}</ref>. Disse påstande blev ved med at komme i starten af 2008 <ref>{{cite web |url=http://www.usatoday.com/life/people/2008-03-06-hayden-heyday_N.htm |title=It's the heyday of hot starlet Hayden Panettiere |date=2008-03-07 |access-date=2008-03-26 |publisher=[[USA Today]]}}</ref><ref>{{cite web |url=http://www.okmagazine.com/news/view/5095 |title=Hayden Panettiere's an Indoor Girl |date=2008-03-10 |access-date=2008-03-26}}</ref> og andre kilder har reporteret at Panettiere har spurgt Ventimiglia, om han ville flytte ind hos hende <ref>{{cite web |url=http://www.transworldnews.com/NewsStory.aspx?id=39367&cat=2 |title=Hayden Panettiere Asks Milo Ventimiglia to Move In |access-date=2008-03-26 |date=2008-03-06 |archive-date=17. april 2008 |archive-url=https://web.archive.org/web/20080417001454/http://www.transworldnews.com/NewsStory.aspx?id=39367&cat=2 |url-status=dead }}</ref><ref>{{cite web |url=http://www.thecheers.org/news/Celebrity/news_14474_Heroes-stars-Hayden-Panettiere-and-Milo-Ventimiglia-are-moving-in-together.html |title='Heroes' stars Hayden Panettiere and Milo Ventimiglia are moving in together |access-date=2008-03-26 |date=2008-03-05}}</ref><ref>{{cite web |url=http://www.celebrity-gossip.net/celebrities/hollywood/hayden-panettiere-moving-in-with-milo-203732/ |title=Hayden Panettiere: Moving in with Milo? |access-date=2008-03-26 |date=2008-03-06 |archive-date= 1. maj 2008 |archive-url=https://web.archive.org/web/20080501025615/http://www.celebrity-gossip.net/celebrities/hollywood/hayden-panettiere-moving-in-with-milo-203732/ |url-status=dead }}</ref>. Tirsdag den [[22. april]] [[2008]], bekræftede Ventimiglia på [[BBC]] radiokanalen i "Breakfast Show", at han rigtigt nok var sammen med Panettiere <ref>{{cite web |url=http://www.bbc.co.uk/1xtra/trevorandzena/heroes.shtml |title=Trevor and Zena meet Milo Ventimiglia |access-date=2008-04-22 |date=2008-04-22}}</ref>.
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