Las Vegas is known for its string of entertainers -- both good and bad -- and the Billboard Music Awards at the MGM Grand on Sunday night (May 22) was no exception.

ABC Viewers and a few thousand fans in the giant theater were seeing stars at the show and ceremony, the first one held in five years. Rihanna, Britney Spears, Nicki Minaj, Beyonce, Neil Diamond, Justin Bieber, Black Eyed Peas and other chart-toppers made the trek to Sin City, and it was performances more than the awards themselves that made for decent viewing.

And that's for the best. The honors themselves are tabulated by a "measure of all key fan interactions with music," from data partnerships that indicate album and single sales, radio data, social networking, the ilk... but from March 2010 to March 2011? And how are fan awards weighed? What's the new Millennium Award anyway? What distinguishes it from the AMAs? Were any prizes catered to artists who could confirm attendance at the show?

This brand identity and crossover opportunity may not need to answer those questions, when we're busy watching The Bieb and Selena Gomez smooch, or as Britney Spears tries again to dominate the stage, or when Rihanna's crawling on a stack of men. Check out our thoughts on this fast-paced, high energy music workout.

Who did you enjoy the most?

Click here to read on who won some of the major awards.
Click here for more photos from the 2011 Billboard Music Awards red carpet.