2.
This is Rihanna in 2009 when she was 21:
6.
This is Kelly Clarkson in 2003 when she was 21:
7.
This is Christina Aguilera in 2002 when she was 21:
8.
This is Elton John in 1968 when he was 21:
9.
This is Austin Butler in 2013 when he was 21:
10.
This is Cher in 1967 when she was 21:
11.
This is Paris Hilton in 2002 when she was 21:
12.
This is Harry Styles in 2015 when he was 21:
13.
This is Julia Louis-Dreyfus in 1982 when she was 21:
14.
This is Sarah Jessica Parker in 1986 when she was 21:
15.
This is Courteney Cox in 1985 when she was 21:
16.
This is Gwyneth Paltrow in 1993 when she was 21:
17.
This is Usher in 1999 when he was 21:
18.
This is Tom Cruise in 1983 when he was 21:
19.
This is Justin Timberlake in 2002 when he was 21:
20.
This is Nick Cannon in 2001 when he was 21:
21.
This is Jake Gyllenhaal in 2001 when he was 21:
22.
This is Jennifer Aniston in 1990 when she was 21:
23.
This is Nicole Kidman in 1989 when she was 21:
24.
This is Tyra Banks in 1994 when she was 21:
25.
This is Britney Spears in 2002 when she was 21:
26.
This is Zendaya in 2017 when she was 21:
27.
This is Leonardo DiCaprio in 1995 when he was 21:
28.
This is Jennifer Lawrence in 2011 when she was 21:
29.
This is Beyoncé in 2002 when she was 21:
30.
This is Ryan Gosling in 2001 when he was 21:
31.
This is Margot Robbie in 2011 when she was 21:
32.
This is Megan Fox in 2007 when she was 21:
33.
This is Taylor Swift in 2010 when she was 21:
34.
This is Zac Efron in 2008 when he was 21:
35.
This is Ariana Grande in 2014 when she was 21:
36.
This is Keke Palmer in 2014 when she was 21:
37.
This is Michael B. Jordan in 2008 when he was 21:
38.
And finally, this is Chris Evans in 2003 when he was 21: