6.Kim Kardashian posted this photo of herself in the 8th grade in 1994:
7.Cher celebrated the 20th anniversary of her CLASSIC single, "Believe," by sharing a clip from the music video for it:
8.Gwen Stefani posted this behind-the-scenes photo taken in 1995, on the set of No Doubt's music video for "Just A Girl":
9.Dan Levy shared this way too cute of pic himself alongside his little sister, Sarah, at her birthday party in the early '90s:
10.Madonna posted this photo of herself and her longtime BFF, Debi Mazar, in the early '80s:
11.Will Smith shared this photo of himself and Celine Dion hanging out backstage at the AMAs in 1991:
12.Nick Jonas posted this photo of himself from the early '00s:
13.Chris Pratt shared this photo of himself in the early '80s, where he looked a bit like Chucky from Child's Play:
14.RuPaul posted this photo of herself serving looks on the streets on New York in 1984:
15.In honor of her 32nd birthday, Lady Gaga shared this photo of herself in 2007, along with a heartwarming message:
16.Mariah Carey posted this photo of herself and Will Smith hanging out together in the early '90s:
17.Ryan Reynolds shared this oh-so-late-'90s photo of himself sporting some pretty Zack Morris looking hair:
18.Emma Watson posted this headshot of herself from the 2000s:
19.In honor of the 25th anniversary of Boy Meets World, Danielle Fishel shared this photo of the cast taken during the filming of the final episode in 2000:
20.Dolly Parton posted the most '80s looking photo of herself and Oprah:
21.Armie Hammer shared his mugshot from 2011, when he was arrested for marijuana possession in Texas:
22.Jennifer Love Hewitt remembered when she and then-boyfriend Carson Daly attended the 1998 VMAs. She also added a sorta shady caption.
23.Nicole Richie shared this cute photo of herself being held by Rashida Jones in the mid-'80s:
24.Halle Berry remembered her role as Miss Stone in 1994's The Flintstones movie:
25.Reese Witherspoon celebrated National Pink Day by posting this screen grab of the queen of pink herself, Elle Woods:
26.Michael B. Jordan shared this sweet photo of himself being held by his older sister, Jamila, in the early '90s:
27.Rashida Jones posted this photo of herself and BFF, Tracee Ellis Ross, in 2000:
28.Julia Roberts shared this photo taken in 1998, on the set of Runaway Bride, alongside her co-star, Richard Gere, and the film's director, the late Garry Marshall:
29.Rob Lowe posted this behind-the-scenes photo of himself with Tom Cruise on the set of their 1983 film, The Outsiders:
30.In honor of her 30th birthday, Rihanna posted a baby photo of herself along with a current day pic:
31.Britney Spears shared this stunning photo of herself taken on the set of her 2001 music video for "I'm a Slave 4 U":
32.Barbra Streisand remembered when she met President Kennedy at the White House Correspondents Dinner in 1963:
33.Janet Jackson celebrated the 25th anniversary of her film Poetic Justice by sharing this promotional photo of herself and her co-star, the late Tupac Shakur:
34.Timbaland took it back to the late '90s, with this awesome photo of himself hanging out with the late Aaliyah, Missy Elliot, and Ginuwine:
35.Viola Davis shared this glamorous photo that she did as part of a 1950s Hollywood-inspired photo shoot for O, The Oprah Magazine in 2009:
36.Cardi B. posted this meme-worthy photo of herself and little sister, Hennessy Carolina, in the late '90s:
37.Michelle Obama shared this photo of herself when she was a student at Princeton in the early '80s:
38.Naomi Campbell posted this classic photo of herself and Kate Mass at a party in the early '90s:
39.Tom Hardy shared this photo of himself from when he was a student at the Drama Centre London in the late '90s:
40.Shangela told the story of the first time she was put in drag by her drag mother, Alyssa Edwards:
41.In honor of Reese Witherspoon's 42nd birthday, Sarah Michelle Gellar posted this photo of the two of them from their iconic 1999 film, Cruel Intentions, vs. today:
42.In celebration of the 20th anniversary of SATC, Sarah Jessica Parker shared a bunch of photos from throughout the series' run:
43.Nicole Kidman took it back to 1995, with this GLAM photo that was part of a Vogue magazine shoot:
44.Brie Larson reminded everyone that she was once a pop singer in 2005:
45.And finally, Jeff Goldblum shared the screen grab from one of the most iconic moments in Jurassic Park, in honor of the film's 25th anniversary: