4.Paul McCartney posted this behind-the-scenes photo from the music video for his 1984 single, "We All Stand Together."
5.Dolly Parton shared this photo of herself getting glammed up in the '70s.
6.Leona Lewis remembered the time she performed with Taylor Swift.
7.Adam Levine shared this photo of himself performing with Maroon 5 in the early '00s.
8.Camilla Belle posted this photo from her 2005 film The Ballad of Jack and Rose.
9.Evangeline Lilly shared this photo of when she went to the Golden Globes in 2005.
10.Joseph Gordon-Levitt remembered the time he performed in the music video for She and Him's (aka Zooey Deschanel's band) "Why Do You Let Me Stay Here?" in 2010.
11.Brandy celebrated the 23rd anniversary of her debut single, "I Wanna Be Down," by posting this clip of herself performing it live in 1994.
12.Busy Philipps posted this photo of herself with Colin Hanks in 1998 — when they were both college students at Loyola Marymount University.
13.And finally, in honor of her BFF Beyoncé's 36th birthday, Gwyneth Paltrow shared this photo of the two of them at the 2007 Oscars.