1. Miley Cyrus posted this super-cute photo of herself with her dad, Billy Ray, and little sister, Noah.
2. Speaking of little sisters, Lena Dunham shared this photo of herself holding her little sister, Grace, in 1992.
3. January Jones continued the sisterly love theme with this photo of herself in the early '80s with her little sister, Jacey.
4. Chris Hardwick took us back to his Singled Out days, when they apparently were setting up flatware on dates.
5. Naomi Campbell shared this gorgeous photo taken in the early ‘90s by the late Herb Ritts.
6. Gwen Stefani took us back to the recording of The Sweet Escape with Pharrell Williams.
7. CeeLo Green got crazy and took us back to his Gnarls Barkley days.
Our music is everlasting #TBT #gnarlsbarkley
8. By the looks of this photo, actor William Levy was a very talkative kid.
9. Adorable: The official Twitter account for Tupac Shakur posted this photo of him as kid.
Now THIS is a throwback 2pac photo! #ThrowbackThursday #tbt
10. Sharon Osbourne was a flawless 12-year-old.
#TBT: Yours truly at age 12.
11. King of Leon's Jared Followill was a quintessential '90s kid in this laser background elementary school photo.
12. Elizabeth Berkley proved she knew how to dance long before Showgirls.
13. And finally, John Stamos remembered the time he and Cloris Leachman brought the hotness to Bob Saget’s roast.
#TBT @Cloris_Leachman "I'm not here to roast @bobsaget , I'm here to f*** John Stamos"