1. Orlando Bloom shared this photo of the haircut he got in order to accommodate his wig while filming The Lord of the Rings.
2. Jared Leto posted this photo of himself from the early-'00s, and basically reminded all of us that he hasn't aged since the '90s.
3. Dolly Parton shared this photo of herself with a very infectious smile.
4. Mick Jagger posted this photo of himself listening to Bob Dylan's Bringing It All Back Home in 1965.
5. Susan Sarandon posted this photo of herself doing humanitarian work in Nicaragua in the early-'80s.
Went to Nicaragua in 1984 to deliver milk and baby food to mothers in need with a group called Madre. #TBT… https://t.co/IvUI62fb3n
6. Jenny Lewis shared this photo of herself getting a huge hug from the ICONIC Lucille Ball — who she costarred with on the 1986 short-lived sitcom, Life with Lucy.
7. Paul McCartney posted this photo of himself relaxing in Jamaica in 1979.
8. Sarah Michelle Gellar shared this adorable childhood photo.
9. And finally, Gal Gadot posted this photo of herself at Comic-Con last year, in honor of it kicking off this week.
#tbt to last year at #ComicCon ❤️ Can’t wait to see you all this weekend #sdcc17 😉