Billboard announced the list of nominees for the 2011 Billboard Music Awards at a press conference held in Las Vegas. The winners will be announced at the Billboard Music Awards show set  to take place at the MGM Grand Garden Arena in Las Vegas on Sunday, May 22nd.  The show presented  in partnership with Chevrolet, and the Las Vegas Convention and Visitors Authority, will air live on from the MGM Grand Hotel and Casino on ABC at 8-11 PM ET/PT. This is the first year that ABC will broadcast the event.

The Billboard Music Awards nominees and winners are determined by chart performance and social and streaming activity as chronicled in Billboard magazine and on Billboard.com during the eligibility period (February 28, 2010 through March 1, 2011).  The forty-six award categories are based on measures provided by selected data partners including sales data shared by Nielsen SoundScan, radio airplay monitored by Nielsen BDS, streaming data measured by Tubemogul and Nielsen BDS, social media consumption gauged by Next Big Sound and tour grosses tracked by Billboard Boxscore.

Leading the list of nominees is Pop singer Rihanna with a total of 18 nominations in categories such Top Artist, Top Female Artist, Top 100 Artist, Top R&B Artist, Top Dance/Electronic Artist, Top Radio Songs Artist, Top Digital Songs Artist, Top Digital Media Artist, Top Social Artist and Top Streaming Artist. Her collaboration with Eminem places "Love the Way You Lie" is also giving the singer a total of six nominations.  

Rapper Eminem is a finalist in 16 award categories including Top Artist, Top Male Artist, Top Billboard 200 Artist, Top Digital Songs Artist, Top Social Artist, Top Streaming Artist Top Digital Media Artist and Top Rap Artist.

Pop sensation Lady Gaga follows with 12 categories including three albums all competing for the award of Top Dance/Electronic Album:  "The Fame," "The Fame Monster" and "The Remix."  "The Fame" is also a finalist for Top Pop Album. Bruno Mars and Justin Bieber are each earning 11 categories and competing for Top New Artist and Top Male Artist.  Other Top New Artist contenders are Ke$ha, Nicki Minaj and Taio Cruz, whose song "Dynamite" is up for five awards including Top Hot 100 Song, Top Digital Song, Top Radio Song, Top Streaming Song (Audio) and Top Pop Song.

Here are the finalists for the 2011 Billboard Music Awards Top Categories:

Top Artist:
Justin Bieber
Eminem
Lady Gaga
Rihanna
Taylor Swift

Top New Artist:
Justin Bieber
Taio Cruz
Ke$ha
Bruno Mars
Nicki Minaj

Top Male Artist:
Justin Bieber
Drake
Eminem
Bruno Mars
Usher

Top Female Artist:
Ke$ha
Lady Gaga
Katy Perry
Rihanna
Taylor Swift

Top Duo/Group:
The Black Eyed Peas
Bon Jovi
Lady Antebellum
Linkin Park
U2

Top Touring Artist:
Bon Jovi
Michael Buble
Lady Gaga
U2
Roger Waters

Top Social Artist:
Akon
Justin Bieber
Eminem
Lady Gaga
Rihanna

Top Streaming Artist:
Justin Bieber
Eminem
Lady Gaga
Rihanna
Shakira

Top Pop Artist:
Justin Bieber
The Black Eyed Peas
Ke$ha
Lady Gaga
Katy Perry

Top R&B Artist:
Alicia Keys
Monica
Rihanna
Trey Songz
Usher

Top Rap Artist:
Drake
Eminem
Lil Wayne
Ludacris
Nicki Minaj

Top Country Artist:
Jason Aldean
Kenny Chesney
Lady Antebellum
Taylor Swift
Zac Brown Band

Top Rock Artist:
Kings of Leon
Linkin Park
Mumford & Sons
Muse
Train

Top Alternative Artist:
The Black Keys
Kings of Leon
Linkin Park
Mumford & Sons
Muse

Top Dance Artist:
The Black Eyed Peas
David Guetta
Lady Gaga
LaRoux
Rihanna

Top Billboard 200 Album:
Justin Bieber -- "My World 2.0"
Susan Boyle -- "The Gift"
Eminem -- "Recovery"
Lady Antebellum -- "Need You Now"
Taylor Swift -- "Speak Now"

Top Pop Album:
Justin Bieber -- "My World 2.0"
Black Eyed Peas -- "The E.N.D."
Ke$ha -- "Animal"
Lady Gaga -- "The Fame"
Katy Perry -- "Teenage Dream"

Top R&B Album:
Monica -- "Still Standing"
Rihanna -- "Loud"
Sade -- "Stronger Than Love"
Trey Songz -- "Passion, Pain & Pleasure"
Usher -- "Raymond v. Raymond"

Top Rap Album:
Drake -- "Thank Me Later"
Eminem -- "Recovery"
Nicki Minaj -- "Pink Friday"
Lil Wayne -- "I Am Not A Human Being"
Kanye West -- "My Beautiful Dark Twisted Fantasy"

Top Country Album:
Jason Aldean -- "My Kinda Party"
Lady Antebellum -- "Need You Now"
Sugarland -- "The Incredible Machine"
Taylor Swift -- "Speak Now"
Zac Brown Band -- "The Foundation"

Top Rock Album:
The Black Keys -- "Brothers"
Jack Johnson -- "To The Sea"
Kid Rock -- "Born Free"
Linkin Park -- "A Thousand Suns"
Mumford & Sons -- "Sigh No More"

Top Alternative Album:
The Black Keys -- "Brothers"
Jack Johnson -- "To The Sea"
Kings of Leon -- "Come Around Midnight"
Linkin Park -- "A Thousand Suns"
Mumford & Sons -- "Sigh No More"

Top Dance/Electronic Album:
Daft Punk -- "Tron Legacy (Soundtrack)"
Lady Gaga -- "The Fame"
Lady Gaga -- "The Fame Monster"
Lady Gaga -- "The Remix"
Owl City -- "Ocean Eyes"

Top Hot 100 Song:
Taio Cruz -- "Dynamite"
Eminem Feat. Rihanna -- "Love The Way You Lie"
Bruno Mars -- "Just The Way You Are"
Katy Perry Feat. Snoop Dogg -- "California Gurls"
Usher Feat. will.i.am -- "OMG"

Top Digital Song:
B.o.B Feat. Hayley Williams -- "Airplanes"
Taio Cruz -- "Dynamite"
Eminem Feat. Rihanna -- "Love The Way You Lie"
Bruno Mars -- "Just The Way You Are"
Katy Perry Feat. Snoop Dogg -- "California Gurls"

Top Radio Song:
Taio Cruz -- "Dynamite"
Eminem Feat. Rihanna -- "Love The Way You Lie"
Bruno Mars -- "Just The Way You Are"
Usher Featuring Pitbull -- "DJ Got Us Fallin' In Love"
Usher Feat. will.i.am -- "OMG"

Top Streaming Song (Audio):
Taio Cruz -- "Dynamite"
Eminem Feat. Rihanna -- "Love The Way You Lie"
Lady Antebellum -- "Need You Now"
Bruno Mars -- "Just The Way You Are"
Nelly -- "Just A Dream"

Top Streaming Song (Video):
Justin Bieber Feat. Ludacris -- "Baby"
Eminem -- "Not Afraid"
Eminem Feat. Rihanna -- "Love The Way You Lie"
Lady Gaga -- "Bad Romance"
Shakira Feat. Freshleyground -- "Waka Waka (This Time For Africa)"

Top Pop Song:
Taio Cruz -- "Dynamite"
Bruno Mars -- "Just The Way You Are"
Katy Perry Feat. Snoop Dogg -- "California Gurls"
Katy Perry -- "Firework"
Katy Perry -- "Teenage Dream"

Top R&B Song:
Alicia Keys -- "Unthinkable (I'm Ready)"
Rihanna Featuring Drake -- "What's My Name"
Trey Songz Feat. Nicki Minaj -- "Bottoms Up"
Usher Feat. will.i.am -- "OMG"
Usher -- "There Goes My Baby"

Top Rap Song:
B.o.B Feat. Hayley Williams -- "Airplanes"
B.o.B Feat. Bruno Mars -- "Nothin' On You"
Eminem Feat. Rihanna -- "Love The Way You Lie"
Far*East Movement Feat. Dev & The Cataracs -- "Like A G6"
Nelly -- "Just A Dream"

Top Country Song:
The Band Perry -- "If I Die Young"
Lady Antebellum -- "Need You Now"
Miranda Lambert -- "The House That Built Me"
Sugarland -- "Stuck Like Glue"
Taylor Swift -- "Mine"

Top Rock Song:
The Dirty Heads Featuring Rome -- "Lay Me Down"
Florence + The Machine -- "Dog Days Are Over"
Mumford & Sons -- "Little Lion Man"
Neon Trees -- "Animal"
Train -- "Hey, Soul Sister"

Top Alternative Song:
Florence + The Machine -- "Dog Days Are Over"
Linkin Park -- "Waiting On The End"
Mumford & Sons -- "The Cave"
Mumford & Sons -- "Little Lion Man"
Neon Trees -- "Animal"

Top Dance Song:
Lady Gaga -- "Bad Romance"
Lady Gaga Feat. Beyonce -- "Telephone"
La Roux -- "Bulletproof"
Edward Maya & Vika Jigulina -- "Stereo Love"
Yolanda Be Cool & Dcup -- "We Speak No Americano"