As the 91st annual Academy Awards approaches this weekend, take a look back at the best red carpet fashion over the last 20 years.

Over the last two decades, the Academy Awards have become the most important night in Hollywood fashion. Check out our favorite red carpet looks from the last 20 years.

• GALLERY: Gwyneth Paltrow Through The Years

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  Gwyneth Paltrow in Ralph Lauren, 1999 (photo by Newsmakers)

• Charlize Theron, 2000

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  Charlize Theron in Vera Wang (Dave McNewOnline USA Inc.)

• Kate Winslet, 2002

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  Kate Winslet in Ben de Lisi (Photo by Vince Bucci/Getty Images)

• Halle Berry, 2002

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  Halle Berry in Elie Saab (Photo by Vince Bucci/Getty Images)

• Beyonce Knowles, 2005

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  Beyonce in Versace. (Photo by Frank Micelotta/Getty Images)

• Salma Hayek, 2005

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  Salma Hayek in Prada in 2005 (Photo by Carlo Allegri/Getty Images)

• Michelle Williams, 2006

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  Michelle Williams in Vera Wang (Photo by Frazer Harrison/Getty Images)

• Anne Hathaway, 2006

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  Anne Hathaway in Armani Prive (Photo by Frazer Harrison/Getty Images)

• Sarah Jessica Parker, 2009

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  Sarah Jessica Parker in Dior Couture (Photo by Jason Merritt/Getty Images)

• Gallery: Happy Birthday, Mila Kunis

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  Purple is definitely your color, Mila Kunis.(Photo by Frazer Harrison/Getty Images)

• Octavia Spencer, 2012

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  Octavia Spencer in Tadashi Shoji. (Photo by Kevork Djansezian/Getty Images)

• Jessica Chastain, 2013

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  Jessica Chastain in Armani Prive (Photo by Jason Merritt/Getty Images)

• GALLERY: Gwyneth Paltrow Through The Years

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  Gwyneth Paltrow in Tom Ford (Photo by Kevork Djansezian/Getty Images)

• Reese Witherspoon, 2013

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  Reese Witherspoon in Louis Vuitton (Photo by Jason Merritt/Getty Images)

• Angelina Jolie, 2014

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  Angelina Jolie in Elie Saab (Photo by Jason Merritt/Getty Images)

• Emma Stone, 2012

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  Emma Stone in Giambattista Valli (Photo by Michael Buckner/Getty Images)

• Kerry Washington, 2014

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  Kerry Washington in Jason Wu (Photo by Frazer Harrison/Getty Images)

• Kate Hudson, 2014

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  Kate Hudson in Versace (Photo by Jason Merritt/Getty Images)

• Lupita Nyong’o, 2014

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  Lupita Nyong'o in Prada (Photo by Jason Merritt/Getty Images)

• Jennifer Lopez, 2015

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  Jennifer Lopez in Elie Saab (Photo by Jason Merritt/Getty Images)

• Rosamund Pike, 2015

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  Rosamund Pike in Givenchy (Photo by Jason Merritt/Getty Images)

• Lady Gaga, 2016

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  Feb 2016: Gaga attends the 88th Annual Academy Awards in Brandon Maxwell. (Photo by Ethan Miller/Getty Images)

• Priyanka Chopra, 2016

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  Priyanka Chopra in Zuhair Murad (Photo by Ethan Miller/Getty Images)

• Viola Davis, 2017

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  Viola Davis in Armani. (Photo by Frazer Harrison/Getty Images)

• Lupita Nyong’o, 2018

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  Lupita Nyong'o in Versace (Photo by Frazer Harrison/Getty Images)

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