Britney Spears flaunts abs, underwear in sparkling see-through two-piece backstage

Billboard Music Awards: Britney's Hits and Misses

Britney Spears was the undisputed star of Sunday night's 2016 Billboard Music Awards.

The winner of the Millennium Award opened the show with a show-stopping medley of her greatest hits (more on that here), stunned on the red carpet in a dress that she basically looked the same in 15 years ago and then -- OOPS! She did it again -- looked completely fabulous backstage while accepting her award.

SEE ALSO: Britney Spears rocks the stage with her greatest hits at the Billboard Music Awards 2016

Wearing a sparkling baby blue, transparent two-piece ensemble with her hair pulled back in an effortless ponytail, Spears looked like her happy, goofy, confident self while posing backstage for a room full of photographers screaming her name.

The "Toxic" singer flaunted her incredible abs between the two pieces of her look, and she also showed off the nude thong she was wearing underneath her glam look.

Check out photos of Britney Spears' revealing backstage and red carpet looks:

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Britney Spear's 2016 Billboard Music Awards fashion
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Britney Spears flaunts abs, underwear in sparkling see-through two-piece backstage
LAS VEGAS, NV - MAY 22: Honoree Britney Spears, recipient of the Millennium Award, poses in the press room during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears, recipient of the Millennium Award, poses in the press room during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Frazer Harrison/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears, recipient of the Millennium Award, enters the press room at the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears, recipient of the Millennium Award, poses in the press room during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears, recipient of the Millennium Award, enters the press room at the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears, recipient of the Millennium Award, poses in the press room during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - MAY 22: Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by JB Lacroix/WireImage)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears, recipient of the Millennium Award, poses in the press room during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by John Shearer/Getty Images)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Lester Cohen/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by JB Lacroix/WireImage)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Lester Cohen/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by JB Lacroix/WireImage)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Lester Cohen/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Lester Cohen/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: Singer Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Frazer Harrison/BBMA2016/Getty Images for dcp)
LAS VEGAS, NV - MAY 22: Honoree Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
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