Have a click through the gallery below for some of the highlights.
- Michelle Obama<p> The First Lady dazzled in gold.</p>
- Taylor Swift and Michelle Obama<p> The First Lady presented Taylor Swift an award for her philanthropic work.</p>
- Kristen Stewart<p> The Twilight beauty showed off her perfect pins in Stella McCartney.</p>
- Selena Gomez<p> Selena Gomez flashed her midriff in a sweet Dolce & Gabbana outfit.</p>
- Ashley Tisdale<p> The High School Musical starlet wore a bright Kymerah hanky-hem dress.</p>
- Emma Stone<p> Emma paired her new blonde hair with a cream Antonio Berardi frock.</p>
- Andrew Garfield<p> Emma's boyfriend Andrew was equally dapper in a maroon suit.</p>
- Heidi Klum and Chris Colfer<p> The model/TV personality and the <em>Glee</em> star get slimed.</p>
- Heidi Klum<p> Pre-slime, and Heidi strikes a pose in her (clean!) Roland Mouret mini dress and thigh-high boots.</p>
- Jada Pinkett Smith<p> Jada shows off her killer mohawk.</p>
- Jada Pinkett Smith with children Willow and Jaden<p> The Pinkett Smith clan were out to support dad Will Smith, who was hosting the show.</p>
- Katy Perry<p> has sword, will perform.</p>
- Katy Perry<p> Katy's performance was medieval battle themed. Of course.</p>
- Kristen Stewart<p> Kristen Stewart accepts the award for Favourite Actress.</p>
- Nicki Minaj<p> Nicki takes to the stage in typically outlandish fashion.</p>
- One Direction<p> The Brit boy band on the red carpet.</p>
- Robert Downey Jnr<p> Robert Downey Jnr joins the long list of celebs to hit the stage.</p>
- Sarah Hyland<p> The night's token Lady in Red.</p>
- Will Smith and Justin Bieber before...<p> The show host and his final guest on stage.</p>
- Will Smith and Justin Bieber after.<p> Uh oh.</p>
- Nick Cannon<p> Nick went for the casual approach in red sportswear.</p>
- Katy Perry<p> Katy got well and truly into the spirit of the occasion in a lime green 'slime' top and skirt, with matching neon Prada heels.</p>
Check out Will Smith and Justin Bieber getting gunged below:
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