Usher, Kylie Jenner, Jaden Smith, Kiernan Shipka, and lots of other Beliebers hit the premiere of Justin Bieber's Believe; Lea Michele and Leona Lewis make appearances at "The X Factor" Season 3 Finale Show; Joe Maganiello celebrates his January 2014 cover of Muscle & Fitness magazine—catch up on Wednesday's top happenings in this edition of Last Night's Parties.

The Guest List

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Karina Smirnoff• Arnold Schwarzenegger• Leona Lewis• Ashley Tisdale• Liz Goldwyn• Kelly Rowland• lea michele• Debby Ryan• Christopher Meloni• Asher Roth• Justin Bieber• Usher• Simon Cowell• Todrick Hall• Demi Lovato• Kylie Jenner• Jaden Smith• Jon M. Chu• Harry Shum Jr.• Mike Posner• Kiernan Shipka• Alec Monopoly• Joe Maganiello• Scooter Braun• Walt Disney Studios• Holly Robinson Peete• Roshon Fegan• Meagan Good• Tom Ortenberg• Katherine McNamara• Tru Hollywood• Casper Smart• Paulina Rubio• Brad Garrett• Chris D'Elia• Gabby Douglas• Tori Kelly• Jessica Jarrell• Regal Cinemas at L.A. LIVE• Luke Benward• Pattie Mallette• Ryan Newman• Ryan Beatty• Mike C. Manning• Pia Mia• Jeffrey Nordling• Prince Royce• China Anne McClain• Victoria Moroles• Dove Cameron• Ryan McCartan• Colton Tran• Carlon Jeffrey• Dillon Lane• Kiersey Clemons• Andrew Caldwell• Amy Farrington• Premiere Of Disney Channel's Cloud 9• FOX's "The X Factor" Season 3 Finale• Jeff Gutt• Johnny Rzeznik• Carlito Olivero• Muscle & Fitness And Joe Maganiello Unveil The January 2014 Issue• Carly Lauren• Nick Demoura• Jacquie Lee• Sadie Calvano• Premiere Of Open Road Films' Justin Bieber's Believe• Justin Bieber's Believe premiere• Justin Bieber's Believe