R&B songstress Alicia Keys joined her idol Stevie Wonder on stage Sunday night (May 20) in Las Vegas at the 2012 Billboard Music Awards for a performance medley that included songs like “Higher Ground,” “Overjoyed” and “Superstitious.”

Right before the performance, Alicia presented Stevie with the Billboard Icon Award, saying, “He inspired me to reach for higher places on the piano and within myself … Thank you for bringing our world so much wonder, thank you for bringing us so much joy, thank you for bringing us so much soul.”

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Nelly Furtado performed her new single “Big Hoops (Bigger the Better)” Sunday night (May 20) at the 2012 Billboard Music Awards in Las Vegas.

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Following an introduction from Whoopi Goldberg, singers John Legend and Jordin Sparks paid tribute to the late R&B icon Whitney Houston at the 2012 Billboard Music Awards in Las Vegas.

John Legend performed “The Greatest Love of All” at the piano, and Whitney’s “Sparkle” co-star Jordin Sparks sang a beautiful rendition of “I Will Always Love You.”

After the performances, Whitney’s daughter Bobbi Kristina accepted the Billboard Millennium Award on behalf of her mother, who died in February 2012.

“I just really want to say thank you to everyone who supported us through it all, not just from when it was good, but when it was bad, to just everything,” the 19-year-old said. “Thank you so much for showing that much love ’cause she deserved it. I’m just blessed to have been in such an incredible woman’s life. There will never be another one, ever.”

Watch the emotional Whitney Houston tribute below:

Cee-Lo Green reunited with his group Goodie Mob Sunday night (May 20) as they paid tribute to The Beastie Boys and the late Adam “MCA” Yauch at the 2012 Billboard Awards in Las Vegas.

In addition to the tribute performance, the Atlanta Hip-Hop group also performed “Fight to Win,” their first new track together in several years.

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Usher thrilled the crowd Sunday night at the 2012 Billboard Music Awards in Las Vegas.

Decked out in a an all-black tuxedo, the sharply dressed singer performed his Pop single “Scream” with a lady in red, who turned into a mirror-image of himself … which sounds really weird, but was actually really cool. (You’ll have to see for yourself!)

“Scream” is the latest single from Usher’s upcoming seventh album “Looking 4 Myself.”

Watch Usher’s 2012 Billboard Music Awards performance below:

Linkin Park lit the stage on fire last night (Sun May 20) as the rock band performed their single “Burn It Down” at the 2012 Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas.

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Katy Perry was “Wide Awake” Sunday night (May 20) as the Pop singer performed her new single Cirque du Soleil-style at the 2012 Billboard Music Awards in Las Vegas.

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Justin Bieber shook up the 2012 Billboard Music Awards Sunday night (May 20) with a swagtastic performance of his new single “Boyfriend,” the first offering from his next album “Believe.”

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Pop singer Carly Rae Jepsen made her big debut American performance Sunday night (May 20) at the 2012 Billboard Music Awards.

Dressed in a sparkly outfit that made her look like a teenager, the 26-year-old Canadian singer — who is signed to “Schoolboy Records,” which is run by Justin Bieber‘s manager Scooter Bruan — performed her catchy single “Call Me Maybe.”

Watch the performance below:

British boy band The Wanted blew the crowd away during the 2012 Billboard Music Awards Sunday night (May 20) in Las Vegas as the quintet performed their songs “Chasing the Sun” and “Glad You Came.”

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A shirtless Chris Brown rocked the stage Sunday night (May 20) 2012 Billboard Music Awards in Las Vegas.

Showing off his flawless dance moves and his fancy footwork, the R&B/Pop star transformed the stage into a “Fun Zone” and gave a highly energetic performance of his “Turn Up the Music” single.

Chris Brown’s next album “Fortune” hits stores next month on June 26th.

Check out his Billboard Awards performance below:

Country music sensation Carrie Underwood gave an incredible performance of her song “Blown Away” last night (Sun May 20) at the 2012 Billboard Music Awards in Las Vegas.

“Blown Away” is the title track of Carrie’s new album, which is in stores now.

Watch Carrie Underwood’s 2012 Billboard Awards performance below:

Kelly Clarkson took center stage Sunday night (May 20) in Las Vegas at the 2012 Billboard Music Awards and performed her new single “Dark Side,” from her latest album “Stronger.”

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Party rockers LMFAO kicked off the 2012 Billboard Music Awards last night (Sun May 20) at the MGM Grand Garden Arena in Las Vegas with a high-energy performance medley of their hit singles “Party Rock Anthem,” “Sorry for Party Rocking” and “Sexy and I Know It.”

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Swizz Beatz and Alicia Keys were among the many celebrity couples who walked the red carpet together Sunday night (May 20) at the 2012 Billboard Music Awards in Las Vegas.

Other couples spotted on the red carpet outside the MGM Grand Garden Arena were R&B singer Monica and her NBA player husband Shannon Brown; country music sensation Carrie Underwood and her NHL player husband Mike Fisher; Lisa Marie Presley and her husband Michael Lockwood; and country singer Luke Bryan and his wife Caroline.

Take a look at the pictures below!

Wiz Khalifa was all smiles as he posed beside his fiancee Amber Rose last night (Sun May 20) on the red carpet of the 2012 Billboard Music Awards, which was hosted at the MGM Grand Garden Arena in Las Vegas.

Some of the other couples who also walked the red carpet included R&B singer John Legend and his supermodel fiancee Christine Teigen; pop singers Jordin Sparks and Jason DeRulo; and actress Jurnee Smollett and her producer/songwriter husband Josiah Bell.

Check out the pictures below!

Some of the biggest names in music/entertainment were on hand to attend the 2012 Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas.

Celebs who posed it up outside on the red carpet included singers Usher, Justin Bieber, Brandy, Miguel, Monica and Robin Thicke; rappers Wiz Khalifa and Swizz Beatz; and many others.

Take a look at the pics below!

The stars were out Sunday night (May 20) as they all gathered in Las Vegas to attend the 2012 Billboard Music Awards.

Some of the big names who gathered on the red carpet outside the MGM Grand Garden Arena to pose for photos included Taylor Swift, Katy Perry, Miley Cyrus, Nelly Furtado, LMFAO, Taio Cruz, The Wanted and many more.

Check out the pics below!