This post contains gifs no larger than 268x201 pixels each. To avoid a choppy experience for the connection-challenged, each post will be hidden under its own spoiler cut. Spoiler cuts disappear once they are clicked, but they hide their contents once again after a quick refresh. So you can see what's in this post and enjoy the comments section all at once!
None of the gifs have been edited either. The most 'editing' done was adding a bit of brightness to the darker ones. That's it.
[KAIA GERBER & RACHEL BILSON]Kaia Gerber & Rachel Bilson
[BRITNEY SPEARS & KATIE HOLMES]Young Britney Spears & young Katie Holmes
[BRITTANY SNOW & ASHLEY OLSEN]Brittany Snow & Ashley Olsen
[CHRISTINE TAYLOR & AUTUMN REESER]Christine Taylor & Autumn Reeser
[KIM KARDASHIAN & NICOLE SCHERZINGER]Kim Kardashian 20 faces ago & Nicole Scherzinger
[REESE WITHERSPOON & SARA PAXTON]Reese Witherspoon & Sara Paxton
[SELENA GOMEZ & DEBBY RYAN]Selena Gomez & Debby Ryan
Source: my brain, my fantabulous gif-making skills