Joe Jonas’ Ex Cast in Super 8 Dan Koelsch, September 26, 2010September 27, 2010 In Brief: How’s that for a catchy title? 19-year-old actress and singer (and yes, former girlfriend to the Jonas brother) Amanda Michalka has been cast in an unknown role (shocker!) in J.J. Abrams’ Super 8. The younger of the sisters that make up the musical duo 78violet formerly called Aly…