Hayden Panettiere and her Heroes costar Milo Ventimiglia, spending a night out together to support their castmate Adrian Pasdar. The two took in his Civil War-era musical Atlanta at the Geffen Playhouse in Los Angeles. After the show, the Heroes castmembers celebrated at bash attended by Pasdar, his wife Natalie Maines and Leonard Roberts, an actor on the NBC show and a costar in Pasdar’s play.  Source