1.Gwen Stefani celebrated the 25th anniversary of No Doubt's breakthrough album, Tragic Kingdom, by sharing this video featuring various music video clips of songs from the album:
2.Paul McCartney remembered John Lennon — on what would have been his 80th birthday — by posting this photo of the two of them in the studio in the late '60s:
3.Charlize Theron celebrated Day of the Girl by sharing this photo of herself as a kid in the early '80s:
4.Madonna posted this video of herself doing interviews with MTV throughout her career:
5.In honor of her 35th birthday, Michelle Trachtenberg shared this too cute photo of herself as a toddler in the late '80s:
6.Katy Perry posted this photo of herself working on music in the late '00s:
7.In honor of National Coming Out Day, RuPaul Drag Race's Jackie Cox shared this photo of herself as an out and proud 16-year-old in 2001:
8.Victoria Beckham spiced up our lives by posting these photos of the Spice Girls in the late '90s:
9.In celebration of Canadian Thanksgiving, Hannah Simone shared this behind-the-scenes photo of herself and Zooey Deschanel filming the Thanksgiving episode of New Girl, which also happened to fall on the Canadian one:
10.Diane Keaton remembered one of her appearances on The Tonight Show with Johnny Carson:
11.Cindy Crawford shared this iconic photo of herself and K.D. Lang, taken for the cover of Vanity Fair in 1993. The photo was recently re-created by Shea Couleé and Baja East's Scott Studenberg for this month's cover of Out Magazine.
12.Sofía Vergara posted these behind-the-scenes photos of herself being photographed by Annie Leibovitz for a 2015 cover story for Vanity Fair:
13.Janet Jackson shared this video of herself being interviewed by Bill Bellamy for MTV, during the New York stop of her Janet World Tour in 1994:
14.Nina Dobrev shared this behind-the-scenes photo of herself, Ian Somerhalder, and Paul Wesley on the set of The Vampire Diaries:
15.And finally, Chris Evans missed the long hair he grew out to play Captain America in Avengers: Infinity War: