All of music's — and some of TV's — biggest stars graced the red carpet at the 2012 Billboard Music Awards in Las Vegas last night! 

OK! GALLERY: JUSTIN BIEBER, KATY PERRY AND JENNIFER LOPEZ ROCK THE HOUSE AT THE AMERICAN MUSIC AWARDS! 

Miley Cyrus, Carrie Underwood, Katy Perry, Justin Bieber, Usher, Gavin DeGraw, Julianne Hough and many more celebs showed up for the event, which honored the late, great Whitney Houston, Donna Summer and the Bee Gees' Robin Gibb, who just lost his fight with cancer. 

OK! NEWS: BEE GEES' ROBIN GIBB DEAD AT 62 

Taylor Swift was also honored with the Billboard Woman of the Year Award, and thanked her legions of fans as she accepted, saying, "I just love you so much. I'm just so humbled and honored by this." 

Check out all the photos! Who wore your favorite look of the night? 

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