2013 was filled with unexpected hair reveals and shocking styles. From Jennifer Lawrence's controversial pixie cut to Miley Cyrus's high-cut leotards, celebrity fashion kept us at the edge of our seats. Some of the biggest stars have evolved so much this year, you may have forgotten what they looked like not so long ago. We've taken a walk down memory lane and uncovered what a difference a few years can make.
The Way They Were: 2013's Biggest Celebrities
The Way They Were: A Look Back at our Favorite Celebs of 2013
Kanye West and Kim Kardashian arrive to attend Givenchy's ready-to-wear Spring/Summer 2014 fashion collection in Paris.
Kanye West accepts the award for best new artist during the 4th annual BET Awards in Los Angeles.
Kim Kardashian and Paris Hilton are at the Prada Los Angeles opening of "Waist Down-Skirts By Miuccia", an exhibit at Prada's Beverly Hills epicenter storen Beverly Hills, Calif.
Miley Cyrus performs onstage during 101.3 KDWBs Jingle Ball 2013 at Xcel Energy Center in St. Paul, Minnesota.
Actress Miley Cyrus appears onstage during MTV's "Total Request Live" at the MTV Times Square Studios in New York.
Actress Lea Michele attends L'Oreal Paris' Women of Worth 2013 at The Pierre Hotel in New York City.
Amanda Bynes attends an appearance at Manhattan Criminal Court in New York City. Bynes is facing charges of reckless endangerment, tampering with evidence and criminal possession of marijuana in relation to her arrest.
Amanda Bynes visits Spring Awakening on Broadway, and poses with Lea Michele.
Beyonce performs onstage at her "Mrs. Carter Show World Tour 2013" at the US Airways Center in Phoenix, Arizona.
R&B trio Destiny's Child, from left, Kelly Rowland, Beyonce Knowles and Michelle Williams, performs on NBC's "Today" show in New York's Rockefeller Plaza.
Singer Taylor Swift walks the runway during the 2013 Victoria's Secret Fashion Show at the 69th Regiment Armory in New York.
Country singer Taylor Swift poses for photographers as she arrives for the 41st Academy of Country Music Awards in Las Vegas.
Singer and UNICEF Goodwill Ambassador Katy Perry attends the ninth annual UNICEF Snowflake Ball at Cipriani Wall Street in New York.
Katy Perry arrives to the "Red is for Emmy" party for Invisible Children in Los Angeles, where the media-based non-profit, Invisible Children premiered their third installment for the Bracelet Campaign - "Emmy: The Story of an Orphan."
Kerry Washington arrives at the Academy of Television Arts & Sciences 63rd Primetime Emmy Awards at Nokia Theatre L.A. Live in Los Angeles, California.
Co-stars from the film 'Save The Last Dance' Kerry Washington, right, and Sean Patrick Thomas arrive at the Teen Choice Awards 2001 in Universal City, Calif. Washington won Choice Breakout Performance for her role in the movie.
American actor Channing Tatum poses during the photocall of 'Asalto al Poder' ('White House Down') at Casa de las Alhajas' in Madrid, Spain.
In this photo released by Dreamworks, Amanda Bynes and co-star Channing Tatum attend a special Teen People screening of their film "She's The Man," in New York.
In costume of 'oiran' high-class geisha girl, US pop music star Lady Gaga look-alike doll, called Gagadoll made of silicon is displayed at a press conference in Tokyo. Lady Gaga was there for the promotion of her latest album 'ARTPOP'.
American singer Lady Gaga performs on the Other stage on the first 'official' day of the annual Glastonbury festival near Glastonbury.
Actor Tom Hanks ('Saving Mr. Banks') on 'Jimmy Kimmel Live'.
Michael J. Fox as Alex P. Keaton and Tom Hanks as Ned Donnelly on 'Family Ties'.
Carrie Underwood as Maria in 'The Sound of Music Live!'
Carrie Underwood performs on 'American Idol' Season 4.
Jennifer Lawrence attends a special screening of 'The Hunger Games: Catching Fire' in New York.
Actress Jennifer Lawrence arrives to the Turner Broadcasting Television Critics Association party in Beverly Hills, Calif.
Kelly Ripa attends CNN Heroes: An All-Star Tribute in New York.
Host Regis Philbin leans over to kiss new co-host Kelly Ripa during a broadcast of "Live with Regis and Kelly" in New York.
Singer Britney Spears speaks to the crowd after arriving at Planet Hollywood Resort & Casino before the debut of her two-year Las Vegas residency "Britney: Piece of Me" in Las Vegas.
Britney Spears kicks off her "Baby One More Time" tour at the Pompano Beach Amphitheater in Pompano Beach, Fla.
Christina Aguilera arrives at the American Music Awards at the Nokia Theatre L.A. Live in Los Angeles.
Christina Aguilera, nominated for best female pop vocal performance for "Genio Atrapado," arrives for the first annual Latin Grammy Awards in Los Angeles.
Sandra Bullock in a scene from "Gravity."
Actress Sandra Bullock arrives for rehearsals for the 68th Academy Awards at the Music Center in Los Angeles.