Spotted: Hayden Panettiere and Stephen Colletti

Should Milo Ventimiglia worry?

Probably not. But it's been a long time since we've seen Hayden Panettiere mingle with her ex, Laguna Beach alum Stephen Colletti - as they did below at the BlackBerry Bold launch in Beverly Hills Thursday - who she once dated for over a year.

Stephen Colletti is reportedly "still friends" with Heroes' Hayden Panettiere.