1. Taylor Swift shared this cute photo of herself dressed up like Laa-Laa the Teletubby and apparently, by the looks of this photo, was taken in the 1950s.
2. Amy Schumer was once an adorable witch in the '80s:
3. Mariah Carey took us back to 2003, when she dressed up as an elusive mermaid.
4. Ian McKellen also took us back to 2003, when he co-starred with Tom Hardy in the film Legend.
#TBT Tom Hardy’s double-act as the Kray twins in “Legend” is https://t.co/GZ5FFZ4je2 we are twelve years ago!
5. Adele posted her very first #TBT and she slayed it.
6. In honor of National Cat Day, Hugh Jackman shared this photo of him and his childhood cat.
7. Also celebrating National Cat Day was Nick Carter, who posted this sweet photo.
Happy #NationalCatDay 🐱 #TBT
8. Nico Tortorella shared this photo from his high school days, when he rocked a puka shell necklace.
9. While Adam DeVine shared a pic from his high school days, when he rocked a hemp necklace.
10. Mario Lopez got into the Halloween spirit by sharing this photo of him and Fergie dressed in costumes for a Halloween episode of Kids Incorporated.
#TBT My girl @Fergie & I in a Halloween episode of 'Kids Incorporated'