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Posted Sun, May 20, 2012 8:15pm EDT

Carrie Underwood stunned in an Oscar de la Renta gown on the red carpet.

THE 2012 BILLBOARD MUSIC AWARDS - THEATRE - "The 2012 Billboard Music Awards" broadcast live from the MGM Grand Garden Arena in Las Vegas, SUNDAY, MAY 20 (8:00-11:00 p.m., ET), on ABC. (Photo by Ethan Miller/Getty Images via ABC) CARRIE UNDERWOOD

THE 2012 BILLBOARD MUSIC AWARDS - BACKSTAGE - "The 2012 Billboard Music Awards" broadcast live from the MGM Grand Garden Arena in Las Vegas, SUNDAY, MAY 20 (8:00-11:00 p.m., ET), on ABC. (Photo by Chris Polk/Getty Images via ABC) USHER

THE 2012 BILLBOARD MUSIC AWARDS - ARRIVALS - "The 2012 Billboard Music Awards" broadcast live from the MGM Grand Garden Arena in Las Vegas, SUNDAY, MAY 20 (8:00-11:00 p.m., ET), on ABC. (Photo by Kevin Mazur/WireImage via ABC) KRIS KRISTOFFERSON, TAYLOR SWIFT

LAS VEGAS, NV - MAY 20: Singer Justin Bieber arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singers Justin Bieber (L) and Usher attend the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Pat Houston (L) and Bobbi Kristina Houston-Brown accept the Millennium Award on behalf of Whitney Houston onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Jordin Sparks performs onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Katy Perry performs onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: The Wanted perform onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Justin Bieber accepts the award for Top Social Artist onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: singer Katy Perry & her Grandma arrive at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)

LAS VEGAS, NV - MAY 20: Singer Carly Rae Jepsen performs onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Justin Bieber performs onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Usher poses in the press room at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Getty Images)

LAS VEGAS, NV - MAY 20: Presenter Robin Thicke poses in the press room at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images)

LAS VEGAS, NV - MAY 20: Rapper Wiz Khalifa winner of the award for Top New Artist poses in the press room at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images)

LAS VEGAS, NV - MAY 20: Singer Justin Bieber at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Billboards2012/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Carly Rae Jepsen arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)

LAS VEGAS, NV - MAY 20: Actress Zooey Deschanel arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)

LAS VEGAS, NV - MAY 20: Chrissy Teigen arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)

Kelly Clarkson performs at the 2012 Billboard Music Awards (Getty)

Chris Brown performs at the 2012 Billboard Music Awards (Getty)

LAS VEGAS, NV - MAY 20: Taylor Swift arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (WireImage)

LAS VEGAS, NV - MAY 20: Katy Perry arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (WireImage)

LAS VEGAS, NV - MAY 20: Jordin Sparks arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (WireImage)

LAS VEGAS, NV - MAY 20: Natasha Bedingfield arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (WireImage)

LAS VEGAS, NV - MAY 20: Alicia Keys arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (WireImage)

LAS VEGAS, NV - MAY 20: Julianne Hough arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (WireImage)

From Justin Bieber to Miley Cyrus, all of the biggest stars are out in Las Vegas. Click to see the best looks from the carpet!

The 2012 Billboard Music Awards brought plenty of stars to the May 20 carpet at the MGA Grand in Las Vegas -- and we loved their style! From Justin Bieber to Miley Cyrus, everyone looked great. Check out our gallery for the best red carpet pics and tell us, HollywoodLifers -- who had the best style? (Getty [2])

LAS VEGAS, NV - MAY 20: Singer Justin Bieber arrives at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)

LAS VEGAS, NV - MAY 20: (L-R) Nathan Sykes, Jay McGuiness, Siva Kaneswaran, Tom Parker and Max George of The Wanted arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Carrie Underwood arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Miley Cyrus arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

Bee Gees Album Cover Image: Amazon

Jan 1970 Bee Gees - Maurice Gibb, Robin Gibb, Barry Gibb (Photo by Chris Walter/WireImage)

Jan 1970 Bee Gees in Los Angeles, California (Photo by Chris Walter/WireImage)

Bee Gees 1977 Barry Gibb, Robin Gibb, Maurice Gibb and Andy Gibb ay Billboard Music Awards in Los Angeles, California (Photo by Chris Walter/WireImage)

LOS ANGELES, CALIFORNIA - 1979: Robin Gibb of the Bee Gees appears in 1979 at Dodger Stadium. (Photo by Chris Walter/WireImage)

Robin Gibb (FameFlynet)

Billboard Music Awards 2012 — Best Red Carpet Looks