If there's an award show where you can expect celebs to go all out, it has to be the American Music Awards.

Over the years, the biggest names in music and pop culture have made the special night as much about fashion as music. That's why before tomorrow's big ceremony, we're looking back at the craziest looks that have hit the AMAs carpet in the past. 

Though a popular Halloween costume now, the most memorable AMAs ensemble of all time has to be Britney Spears and Justin Timberlake's denim-on-denim look in 2001. Joining the duo that year in making fashion history was girl group Destiny's Child with their matching groovy costumes.

As celebs continued to show off more iconic throughout the years, Lady Gaga found a way to do things a little differently. The two-time American Music Award winner entered the 2013 award's red carpet on a white horse dressed in a Game of Thrones-like dress.

With an all-star line-up this year including Lizzo, Billie Eilishand Camila Cabello, it's sure to be an unforgettable night. Plus, Taylor Swift will be honored with the Artist of the Decade award to close out a remarkable year for the star.

Before the show begins, however, you have to look back on a few unforgettable looks in the gallery below.

Lady Gaga, 2013 American Music Awards

Larry Busacca/AMA2013/Getty Images for DCP

Poppy, 2018 American Music Awards

Broadimage/Shutterstock

Post Malone, 2018 American Music Awards

Matt Baron/Shutterstock

Willow Smith, 2010 American Music Awards

Matt Baron/BEI/Shutterstock

Frankie Grande, 2014 American Music Awards

Paul Buck/EPA/Shutterstock

TLC, Lil Mama, Tionne 'T-Boz' Watkins, Chilli, 2013 American Music Awards

Jim Smeal/BEI/Shutterstock

Kesha, 2010 AMERICAN MUSIC AWARDS

ABC/RICK ROWELL

Britney Spears, Justin Timberlake, 2001 American Music Awards

LUCY NICHOLSON/AFP/Getty Images

ESC: American Music Awards, Destiny's Child, Beyonce

KMazur/WireImage

Diana Ross, America Music Awards, 2017

ABC/Image Group LA

ESC: Nicki Minaj, AMAs, Oscar de la Renta

ABC/RICHARD HARBAUGH

Bleona Qereti, American Music Awards 2014

Jason Merritt/Getty Images

Jennifer Lopez, American Music Awards 2014

Jason Merritt/Getty Images

Halsey, AMAs, 2016 American Music Awards, Arrivals

Frazer Harrison/AMA2016/Getty Images for dcp

Julia Michaels, American Music Awards 2017, AMAs

Neilson Barnard/Getty Images

ESC: Nicki Minaj

Mazur AMA 2010/WireImage

Rebel Wilson, 2015 American Music Awards

Mark Davis/Getty Images

Sabrina Carpenter, America Music Awards, 2017

Neilson Barnard/Getty Images

Jeannie Mai, AMAs, 2016 American Music Awards, Arrivals

Frederick M. Brown/Getty Images

ESC: Missy Elliott

SGranitz/WireImage

Karlie Kloss, AMAs, 2016 American Music Awards, Arrivals

Frazer Harrison/AMA2016/Getty Images for dcp

ESC: Worst Dressed, American Music Awards, Joan Smalls

Matt Baron/REX/Shutterstock

Rita Ora, American Music Awards 2014

Jason Merritt/Getty Images

Chrissy Teigen, AMAs, 2016 American Music Awards, Arrivals

Frederick M. Brown/Getty Images

Janelle Monae, AMAs, 2016 American Music Awards, Arrivals

Jordan Strauss/Invision/AP

Olivia Munn, AMAs, 2016 American Music Awards, Arrivals

Frazer Harrison/AMA2016/Getty Images for dcp

Mark your calendars! The 2019 American Music Awards, live from the Microsoft Theater in Los Angeles, airs Sunday night at 8 p.m. on ABC.

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