Katy Perry, Emma Stone, Heidi Klum, Adam Sandler and more hit the Orange Carpet for the green slime-filled Nickelodeon Kids' Choice Awards; Anna Paquin, Sandra Oh, and Cat Deely hand out the awards for the nation's most talented student film makers in Hollywood; Elijah Wood, Jaime King and Edward Norton prove step out in support of the great majority at the All In For The 99% Event on Saturday night—from awards ceremonies and "Mad Men"-inspired soirees, we have the scoop on who partied where this weekend in L.A. in this Monday edition of Last Night's Parties!

Clockwise: Andrew Garfield, Emma Stone [via], Jaden Smith, Jada Pinkett Smith, Willow Smith [via], Shepard Fairey, Ted Soqui [via]

Katy Perry Heidi Klum Elijah Wood Kristen Stewart Chris Rock Arnold Schwarzenegger King Kong Travis Barker Selena Gomez Perez Hilton Al Roker Edward Norton Zac Efron Taylor Swift Jack Black Ashley Tisdale Kids' Choice Awards Jennie Garth Nick Cannon Ludacris Anna Paquin Slime Taylor Lautner Mad Men Scott Porter Sandra Oh Mark-Paul Gosselaar Halle Berry Nickelodeon Don Draper Jaime King Jason Alexander Sasha Obama Malia Obama Robert Downey Jr. Justin Bieber Adam Sandler Julie Bowen Emma Stone USC Kelly Osborne Jada Pinkett Smith Will Smith Joel McHale Shepard Fairey Michele Obama Jaden Smith Miranda Cosgrove Willow Smith Roger Sterling Cat Deely Andrew Garfield Matthew Weiner Dino De Laurentiis Nicki Minaj Chris Colfer Rex Lee Rain Phoenix Cee Lo Green Justin Beiber Michael Lombardo Jena Malone Kate Linder Ashlan Gorse Geena Davis Tim Tebow Eliza Coupe Matthew Gray Gubler Cody Simpson Paul Blackthorne Ross Matthews Matthew Fahey Michael Mann Jaeger LeCoultre Joan Van Ark Cress Williams Beth Reisgraf Zachary Knight Elizabeth Daley Jonathan Mostow Martha De Laurentiis Raffaella De Laurentiis Dante Spinotti Alessandro Ago Phillipe Bonay Alexandra Ella Emma Slater Van Jones Kit "Pistol" Scarbo The Galen Center Nickelodeon Kid's Choice Awards Academy of Television Arts & Sciences Foundation's 33rd Annual College Television Awards The Renaissance Hollywood Hotel Jaeger-LeCoultre Beverly Hills Mad for Reverso Jaeger-LeCoultre Mad for Reverso USC School of Cinematic Arts Honors Dino De Laurentiis Eileen J. Norris Theater at USC Bitter Rice