4.Jeff Goldblum shared this photo of himself in the late '60s:
5.Salma Hayek remembered when she voiced Kitty Softpaws in 2011's Puss in Boots:
6.Natalie Portman shared this photo of herself taken on the set of 1996's Mars Attacks!:
7.Joan Collins posted this ICONIC clip of Dominique Deveraux and Alexis Carrington shading each other on Dynasty:
8.Dolly Parton celebrated the 27th anniversary of her film Straight Talk by sharing this screengrab from it:
9.Pee-wee Herman (aka Paul Reubens) shared this photo of himself and Cyndi Lauper hanging out together in 1983:
10.Kylie Minogue posted this photo of herself in the '80s:
11.In honor of Mother's Day in the UK, Paul McCartney (left) shared this photo of himself with his late mother, Mary, and brother, Mike, in the late '40s:
12.Megan Mullally posted this headshot of herself from the early '90s:
13.Reese Witherspoon shared this photo of herself taken for Marie Claire in 2011:
14.Sarah Michelle Gellar did a 21-year challenge: Sharing these photos of herself and BFF Selma Blair at Disneyland in 1998 and today:
15.And finally, Oprah Winfrey paid tribute to Maya Angelou on what would have been her 91st birthday: