Arnold Schwarzenegger and Tim Tebow attend the Los Angeles premiere of Act of Valor at the ArcLight Cinemas in Hollywood; Uggie, the loveable pup from The Artist wins top honors at the first ever Golden Collar Awards; Shepard Fairey, Weird Al Yankovic and Mark Hoppus attend "The Simpsons" 500th Episode Celebration at the Hollywood Roosevelt Hotel—Los Angeles was still popping off after a jam-packed weekend of Grammy parties and we have the details on what went down and who braved another round of events on Monday in this edition of Last Night's Parties!

[Jean Dujardin, Uggie via]

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