40th American Music Awards Fashion

From left, Athlete Mike Fisher and singer Carrie Underwood.

From left, Athlete Mike Fisher and singer Carrie Underwood.  (Jason Merritt / Getty Images)

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Looks from the 40th American Music Awards held at Nokia Theatre L.A. Live in Los Angeles.

40th American Music Awards

Justin Bieber.  (Jordan Strauss / Invision / Associated Press Photos)

40th American Music Awards

Christina Aguilera.  (Jordan Strauss / Invision / Associated Press)

40th American Music Awards

Kelly Rowland.  (Jordan Strauss / Invision / Associated Press Photos)

40th American Music Awards

Nicki Minaj .  (Jason Merritt / Getty Images)

40th American Music Awards

Lucy Hale.  (Jason Merritt / Getty Images)

40th American Music Awards

Hayden Panettiere.  (Jordan Strauss / Invision / Associated Press Photos)

40th American Music Awards

Chris Brown.  (Jason Merritt / Getty Images)

40th American Music Awards

Brandy.  (Jason Merritt / Getty Images)

40th American Music Awards

From left, Jordin Sparks and Jason Derulo.  (Jason Merritt / Getty Images)

40th American Music Awards

Taylor Swift.  (Matt Sayles / Associated Press Photos)

40th American Music Awards

Colbie Caillat.  (John Shearer / Invision Photography / Associated Press Photos)

40th American Music Awards

From right, Luke Bryan and wife Caroline.  (Jason Merritt / Getty Images)

40th American Music Awards

From left, Adrian Young,Gwen Stefani, Tony Kanal and Tom Dumont, of No Doubt.  (Jordan Strauss / Invision / Associated Press Photos)

40th American Music Awards

Carly Rae Jepsen.  (Jordan Strauss / Invision / Associated Press Photos)

40th American Music Awards

From left, Charles Kelley, Hillary Scott and Dave Haywood of Lady Antebellum.  (Jason Merritt / Getty Images)

40th American Music Awards

From left, MC Hammer and Psy.  (Jason Merritt / Getty Images)

40th American Music Awards

Jenny McCarthy.  (Jordan Strauss / Invision / Associated Press Photos)