Michael C. Hall, Jon Voight, Matt LeBlanc and more stars from the popular Showtime series gather in Beverly Hills to celebrate the holidays; Usher, Amber Riley and more tribute Scooter Braun, Jane Lynch and Caren Brooks at the Southern California's ACLU Bill of Rights Dinner; Justin Bieber, Ke$ha, Psy and more perform for the second night of KIIS Jingle Ball; Betty White and adorable four-legged friends help celebrate the first anniversary of Love & Leashes at Westside Pavilion—find out more about L.A.'s top events from Monday in this installment of Last Night's Parties.