Cheyenne Jackson, David Boreanaz, Julian McMahon and Kate Walsh help launch DIRECTV's new "Full Circle" series at Bagatelle; Danny Trejo, Mel Gibson, Sofia Vergara, Alexa Vega, Paris Hilton, Josh Brolin, and more hit the premiere and after party for Robert Rodriguez's Machete Kills; Joe Mategna is honored by Actors For Autism—read up on Wednesday's dazzling events in this edition of Last Night's Parties.