1.In honor of her 23rd birthday, Zendaya shared this photo of herself in the early '00s:
2.Ariana Grande celebrated the sixth anniversary of her debut album, Yours Truly, by posting the cover art for it:
3.Hillary Clinton remembered when Mick Jagger and The Rolling Stones came to visit the White House in 1994:
4.Michelle Pfeiffer shared this photo of herself taken on the set of her 1996 film, One Fine Day:
5.Salma Hayek remembered the late Peter Lindbergh, by sharing these photos he took of her as part of a Gap campaign in the '00s:
6.Gwen Stefani also remembered Peter Lindbergh by sharing these photos he took of her in the '00s:
7.In celebration of their 17th wedding anniversary, Sarah Michelle Gellar shared these photos of herself and hubby Freddie Prinze Jr. on their wedding day:
8.The Muppets took it back to the '90s with their #TBT:
9.Michelle Obama shared her elementary school photo in honor of kids going back to school:
10.Jennifer Garner also celebrated the kids going back to school by sharing her elementary school photo as well:
11.Cindy Crawford celebrated her daughter, Kaia Gerber's, 18th birthday by posting these then and now photos of her:
12.And finally, Elton John remembered his good friend, Princess Diana, on the 22nd anniversary of her death: