Celebrities seem to live such glamorous lives, it's important to remember they're just like us.
They have bad hair days, go through marriage trouble, and have awkward teenage phases.
Some stars are unlucky enough to have their high school days captured for posterity in their yearbook photos.
A few look just the same as they do today, while others are completely unrecognizable.
Check out how their high school days measured up to yours:
1. Alec Baldwin
Baldwin is looking much more like his younger self after his impressive weight loss.
2. Matthew McConaughey
McConaughey was voted "most handsome" in his graduating class - go figure.
3. Blake Shelton
Hard to believe that mulleted cowboy grew up to be People's Sexiest Man Alive.
4. Ashton Kutcher
5. Justin Bieber
6. Barack Obama
7. Julia Roberts
No surprise here, but the teenage Roberts looked just like her famous niece.
8. Tom Cruise
10. Taylor Swift
11. Jennifer Aniston
12. Amy Adams
13. Cameron Diaz
I wonder if Diaz's nearly-identical sister rocked the same awesome hairdo in high school?
14. Katy Perry
In case you didn't know, Perry had a serious reason for chopping off her famous locks.
15. Jennifer Garner
16. Angelina Jolie
As Jolie has revealed, her love life was a little bizarre before meeting Brad Pitt.
17. Johnny Depp
Yes, it's hard to believe but Depp really looked that young once.
18. Gwyneth Paltrow
19. George Clooney
You have to wonder if George Clooney's twins will take after his looks or their mother's.
20. Chris Pratt
Now a movie star, Pratt was just a cashier when he took this picture.
21. Renee Zellweger
Zellweger has changed her looks again recently, for her role as another famous actress.
22. Channing Tatum
23. Sean Penn
24. Robert Downey Jr.
25. Matt Damon
I bet you didn't realize Damon is married to one of his lucky fans.
26. Jeff Bridges
27. Reese Witherspoon
Witherspoon is still a dead ringer for her daughter, but during her teenage years they were almost identical.
28. Jennifer Lopez
The proud mother of two now looks completely different from her high school days.
29. Victoria Beckham (Posh Spice)
With rumors swirling about a Spice Girls reunion, it's impressive to see how little Beckham has changed through the years.
30. Courteney Cox
31. Kim Kardashian
32. Ben Affleck
Yes, Affleck is looking a little different these days, but he assures his fans there's no reason to worry.
The Material Girl was always a bit of a wild child, and it seems like it's rubbing off on her own children.
34. Sandra Bullock
Bullock's career is doing better than ever, years after her husband's infamous cheating scandal.
The best revenge is living well!
35. Meryl Streep
Streep's daughter is also an actress, and looks just like her throwback photos.
36. Carrie Underwood
Underwood is looking a little different these days after a nasty fall, but you can still see the resemblance.
37. Amy Poehler
Poehler's hair was just as glamorous in her prom pictures.
38. Tina Fey
Fey worked as a babysitter before making her big break in comedy.
39. Owen Wilson
40. Bill Clinton
41. Hillary Clinton
42. Mila Kunis
Kunis first met her future husband, Ashton Kutcher, just a few years after this photo was snapped.
43. Oprah Winfrey
This teenager had no idea she would grow up to be a billionaire.
44. Gwen Stefani
While her beau Blake Shelton was a real country boy, Stefani was definitely not a country girl as a teen.
45. Donald Trump
46. Jamie Foxx
It's hard to imagine Foxx's new flame, Katie Holmes, would have been as impressed by him in high school.
47. Billy Bob Thornton
Were these the good looks that impressed Thornton's ex-wife Angelina Jolie?
48. Jimmy Fallon
Yep, the baby-faced talk show host has barely aged a day.
49. Kirstie Alley
50. Harrison Ford
51. Matt LeBlanc
Did any of these pictures surprise you? How embarrassing were your yearbook photos?