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.

The Guest List

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Seth Green• Showtime• Alicia Keys• Kathy Griffin• Stephanie Pratt• Flo Rida• Lisa Kudrow• Betty White• Jordin Sparks• Jane Lynch• James Van Der Beek• NeNe Leakes• Jason Derulo• Justin Bieber• Ke$ha• Usher• Kendall Jenner• michael c. hall• Ariana Grande• Lucy Punch• Kylie Jenner• Clare Grant• Matt LeBlanc• Jennifer Carpenter• Jon Voight• Westside Pavilion• Carrie Ann Inaba• Dexter• Matthew Weiner• Beau Bridges• Amber Riley• Kyle Richards• Afrojack• Sarah Shahi• Steve Howey• Scooter Braun• Jaimie Hilfiger• Jay Roach• Episodes• Alexa Vega• Chris Harrison• Homeland• Morena Baccarin• Diego Klattenhoff• Mark Ballas• Caren Brooks• The Beverly Wilshire Four Seasons Hotel• Roshon Fegan• Glynn Turman• Dawn Olivieri• Shameless• The Wanted• Elaine Hendrix• Zuleikha Robinson• BC Jean• Owl City• Nokia Theatre L.A. Live• Ray Stevenson• Psy• Betty White Hosts L.A. Love & Leashes 1st Anniversary• Love and Leashes• Love & Leashes• Showtime 7th Annual Holiday Soiree• Pooch Hall• Paula Malcomson• Andrea Anders• The Real L Word• Web Therapy• Showtime Holiday Soiree• ACLU Of Southern California's 2012 Bill of Rights Dinner• ACLU• ACLU Of Southern California• Bill of Rights Dinner• Michael Colyar• KIIS FM's Jingle Ball 2012 - Night 2• KIIS FM's Jingle Ball• KIIS FM's Jingle Ball 2012• Arie Luyendyk• Adam Young