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2012 Billboard Music Awards

LMFAO, Katy Perry, Taylor Swift, Justin Bieber and more big stars take center stage in Las Vegas.

Michael Lockwood and his wife Lisa Marie Presley arrive at the Billboard Music Awards in Las Vegas on Sunday, May 20. Frazer Harrison / Getty Images
LMFAO perform at the Billboard Music Awards. The band won song of the year for "Party Rock Anthem" and top duo/group, plus four more honors. Ethan Miller / Getty Images
Katy Perry assists her 91-year-old grandmother on the red carpet at the Billboard Music Awards in Las Vegas. Perry's grandmother also accompanied her to the 2011 Grammy Awards. Frazer Harrison / Getty Images
"Modern Family" stars Ty Burrell and Julie Bowen host the Billboard Music Awards in Las Vegas. Ethan Miller / Getty Images
Miley Cyrus presents the award for Top New Artist onstage at the Billboard Music Awards. Ethan Miller / Getty Images
Top New Artist went to rapper Wiz Khalifa at the Billboard Music Awards. Ethan Miller / Getty Images
Onetime "American Idol" winner Kelly Clarkson performs onstage at the Billboard Music Awards. Ethan Miller / Getty Images
Katy Perry accepts the Billboard Spotlight award. Christopher Polk / Getty Images
Presenter Natasha Bedingfield pays tribute to Donna Summer with a rendition of the late diva's "Last Dance" at the Billboard Music Awards on Suunday, May 20. Ethan Miller / Getty Images
The Wanted perform onstage at the Billboard Music Awards. Christopher Polk / Getty Images
Taylor Swift accepts the Woman of the Year award onstage at the Billboard Music Awards. Ethan Miller / Getty Images
Usher performs onstage at the Billboard Music Awards in Las Vegas on Sunday, May 20. Ethan Miller / Getty Images
Carly Rae Jepsen performs onstage at the Billboard Music Awards. Ethan Miller / Getty Images
Katy Perry performs "Wide Awake" onstage at the Billboard Music Awards. Christopher Polk / Getty Images
Former "American Idol" winner Carrie Underwood performs onstage at the Billboard Music Awards in Las Vegas. Ethan Miller / Getty Images
Justin Bieber performs "Boyfriend" onstage at the Billboard Music Awards. The 18-year-old picked up a social artist award Sunday night. Ethan Miller / Getty Images
Nelly Furtado performs onstage at the Billboard Music Awards. Ethan Miller / Getty Images
John Legend performs onstage at the Billboard Music Awards. He was part of a tribute to the late Whitney Houston. Christopher Polk / Getty Images
"American Idol" winner Jordin Sparks performs at the Billboard Music Awards in Las Vegas. She was part of a tribute to Whitney Houston, and stars in Houston's last film, "Sparkle," to be released in August. Christopher Polk / Getty Images
Whitney Houston's sister-in-law, Pat Houston, and daughter Bobbi Kristina Houston-Brown accept the Millennium Award on her behalf at the Billboard Music Awards. "I'm just blessed to have been in such an incredible woman's life; there will never be another one, ever," said Houston-Brown. Ethan Miller / Getty Images
Chris Brown performs onstage at the Billboard Music Awards. Ethan Miller / Getty Images
Dancer Jean Sok performs onstage during Cee-Lo Green's performance with Goodie Mob at the Billboard Music Awards. They sang the Beastie Boys song "(You Gotta) Fight For Your Right (To Party)," in honor of the late Adam Yauch. Christopher Polk / Getty Images
Alicia Keys helps Stevie Wonder accept the Billboard Icon Award in Las Vegas. Christopher Polk / Getty Images
Alicia Keys and Stevie Wonder perform onstage at the Billboard Music Awards. The pair performed his songs "Higher Ground" and "Overjoyed," and Wonder ended his set with "Superstition." Ethan Miller / Getty Images