25/30
Instagram
Amy Sedaris
This young lady grew up to become a big star.
26/30
Instagram
Topher Grace
This youngster grew up to become a Hollywood leading man.
27/30
Seth Poppel/Yearbook/National News/ZUMAPress
Sean Penn
A lil' angsty, but who wasn't at that age?
28/30
Ancestry.com
Heather Locklear
Gotta' love the hair do.
29/30
Instagram
Andrew Rannells
In years, this kid became a Broadway regular.
30/30
Instagram
Maksim Chmerkovskiy
The former Dancing With the Stars cast member appears at age 17 in a yearbook photo from Edward R. Murrow High School in Brooklyn, N.Y.