1.Taylor Swift celebrated the success of her album 1989 by sharing this tween photo of herself.
2.Kim Kardashian reminded us that she and Nicole Richie were once just ordinary teenagers.
3.Chris Pratt's first headshot was all sorts of amazing.
4.January Jones (the unofficial queen of #TBT) bravely shared this elementary school photo, where she sported a rather interesting haircut.
5.Speaking of brave, Tom Brady shared this adorably awkward photo of himself in the early '90s.
6.Justin Timberlake once had "the Power of Grayskull!"
7.Barbra Streisand posted this epic photo of herself hanging out with Michael Douglas, Mick Jagger, Meryl Streep, and Jerry Hall in 1989.
8.Paris Hilton once partied with “cool mom” Kris Jenner.
9.Britney Spears shared the love by posting a double #TBT photo featuring her older brother, Bryan, and younger sister, Jamie Lynn.
10.Mel B (aka Scary Spice) gave us a huge dosage of "Girl Power" with her Spice Girls #TBT.
11.As a kid, Ewan McGregor looked like a Police-era Sting.
12.The LA Galaxy’s Robbie Rogers was adorably messy while eating spaghetti as kid.
13.While Ellen DeGeneres was just plain adorable in her baby photo.
14.Brooke Shields shared this awesome photo of herself with the legendary Lucille Ball.
15.Madonna took us back to 1991, when she took Michael Jackson as her date to the Oscars.
16.While Andy Cohen took us all the way back to 1983, with this photo of himself at 15.
17.Tamera Mowry gave us a Sister, Sister flashback.
18.Jeremy Renner really worked a Boy George meets INXS look to an ’80s-themed prom he attended 10 years ago.
19.Victoria Beckham marked 15 years of marriage by sharing this wedding photo of herself and her husband, David, in matching purple outfits at their wedding reception.
20.Gwen Stefani took us back to the mid-'90s when she first meet her husband, Gavin Rossdale.
21.Miley Cyrus posted this super cute photo of herself with her dad, Billy Ray, and little sister, Noah.
22.Vice President Joe Biden tried to sell us on health care, but really he just sold us on how sexy he once was.
23.Rachel Dratch shared this photo of herself with Tina Fey and Amy Poehler — the perfect trifecta of comedy.
24.Jenna von Oy (aka Six on Blossom) shared this photo of herself with Fresh Prince’s Tatyana Ali, Step by Step’s Christine Lakin, Keri Russell, and Boy Meet’s World’s Danielle Fishel — basically all the girls every teenage guy in 1995 dreamed about.
25.Andrea Barber (aka Kimmy Gibbler) gave us an awesome Full House flashback with this on-set photo of her with co-star Candace Cameron (aka D.J. Tanner) in 1988.
26.Speaking of Full House, John Stamos shared this photo of himself with Mary-Kate and Ashley Olsen during the filming of the Walt Disney World episode.
27.Carson Daly remembered this epic photo of the TRL Class of 1999.
28.Tyra Banks served us some early '90s Blossom-esque fashion.
29.Katy Perry's early '00s T-shirt accurately predicted the future.
30.Orange Is the New Black’s Uzo Aduba shared this magazine cover of herself and her sister during their track star days.
31.Super cute: Aziz Ansari as a toddler.
32.Dolly Parton remembered her first (and maybe best) movie role ever as Doralee Rhodes in 9 to 5.
33.Stevie Nicks took us back to her "gypsy" days with this cool selfie.
34.Tom Cruise shared this photo of himself and his co-stars Sean Penn and Timothy Hutton on the set of their film Taps.
35.Laura Prepon had an epic early '90s hair wave in this elementary school photo.
36.Drake reminded us that we all go through an awkward phase.
37.Colin Powell posted a 60-year-old selfie.
38.Cindy Crawford posted an actually glamorous-looking Glamour Shot.
39.Lance Bass not only looked back at NSYNC’s 1998 AMA outfits, but also remembered that they actually helped design them.
40.Veep's Reid Scott had an adorable elementary school photo.
41.Adam Sandler really tried to work a “smoldering” look in his first headshot.
42.Busy Philipps gave us a peek at her very late-'80s-looking tween bedroom.
43.Speaking of late '80s looks, Tiffani Thiessen's frosted bangs and mall hair looked spectacular.
44.So cute: Lupita Nyong'o's baby photo.
45.President Bill Clinton posted this photo of himself with daughter Chelsea in honor of her birthday.
46.Victoria Justice shared this photo of herself with Josh Hutcherson and Avan Jogia looking frightened.
47.Kelly Rowland posted a very cool photo of her and Beyoncé hanging out with Aaliyah at the 2001 MTV Movie Awards.
48.Mayim Bialik reminded us of her pre-Blossom TV show Molloy, which co-starred Jennifer Aniston.
49.Heartwarming: this childhood photo of first lady Michelle Obama and her older brother, Craig Robinson.
50.Ricky Martin proved that he has always had great hair.
51.While Kerry Washington proved that she's always been stylish.
52.This photo of Sarah Michelle Gellar with Alyson Hannigan was late '90s magic.
53.Tom Hanks shared this photo in honor of his 58th birthday.
54.Awww, Beyoncé as a baby was THE CUTEST.
55.And finally, Dwayne “The Rock” Johnson had the best #TBT of the year with his epically '90s photo — complete with fanny pack.