Justin Bieber in 2009 (Photo by Bryan Bedder/Getty Images)
Justin Bieber in 2016 (Photo by Frederick M. Brown/Getty Images)
Lily Allen in 2006 (Photo by Sean Gallup/Getty Images)
Lily Allen in 2015 (Photo by Tristan Fewings/Getty Images)
Chris Pratt in 2011 (Photo by Jason Merritt/Getty Images)
Chris Pratt in 2016 (Photo by Mike Coppola/Getty Images for NBC)
Cheryl in 2003 (Photo by Getty Images)
Cheryl Cole in 2016 (Photo by Tristan Fewings/Getty Images)
Miley Cyrus in 2006 (Photo by Paul Hawthorne/Getty Images)
Miley Cyrus in 2016 (Photo by Christopher Polk/Getty Images for iHeartMedia)
Jennifer Hudson in 2004 (Photo by Bowers/Getty Images)
Jennifer Hudson in 2016 (Photo by Mike Windle/Getty Images)
Christina Aguilera in 2002 (Photo by Mark Mainz/Getty Images)
Christina Aguilera in 2015 (Photo by Michael Loccisano/Getty Images)
Heidi Montag in 2006 (Photo by Mark Mainz/Getty Images)
Heidi Montag in 2015 (Photo by Alberto E. Rodriguez/Getty Images)
Calvin Harris in 2008 (Photo by Jonathan Wood/Getty Images)
Calvin Harris in 2016 (Photo by Gareth Cattermole/Getty Images)
Kelly Osbourne in 2002 (Photo by David Klein/Getty Images)
Kelly Osbourne in 2016 (Photo CHRIS DELMAS/AFP/Getty Images)
Charlotte Crosby in 2011 (Photo by Hamish Blair/Getty Images)
Charlotte Crosby in 2016 (Photo by Anthony Harvey/Getty Images for MTV)
Kate Winslet in 1996 (Photo Vince Bucci/AFP/Getty Images)
Kate Winslet in 2016 (Photo by Cindy Ord/Getty Images for London Fog)
Evan Rachel Wood in 2002 (Photo by Vince Bucci/Getty Images)
Evan Rachel Wood in 2017 (Photo by Frazer Harrison/Getty Images)
Kylie Jenner in 2010 (Photo by Angela Weiss/Getty Images)
Kylie Jenner in 2016 (Photo by Gustavo Caballero/Getty Images for New York Fashion Week: The Shows)
Nicole Kidman in 1995 (Photo PATRICK HERTZOG/AFP/Getty Images)
Nicole Kidman in 2017 (Photo VALERIE MACON/AFP/Getty Images)
Adele in 2008 (Photo by Gareth Cattermole/Getty Images)
Adele in 2016 (Photo by Kevin Winter/Getty Images for BT PR)
Nick Jonas in 2008 (Photo by Charley Gallay/Getty Images for AMA)
Nick Jonas in 2017 (Photo by Frederick M. Brown/Getty Images)
Jared Leto in 2003 (Photo by Pascal Le Segretain/Getty Images)
Jared Leto in 2016 (Photo by Jamie McCarthy/Getty Images)
Nicholas Hoult in 2007 (Photo by Rosie Greenway/Getty Images)
Nicholas Hoult in 2016 (Photo by Andreas Rentz/Getty Images)
Matthew Lewis in 2005 (Photo by Chris Harding/Getty Images)
Matthew Lewis in 2016 (Photo by Gerardo Mora/Getty Images)
Mischa Barton in 2001 (Photo by Sebastian Artz/Getty Images)
Mischa Barton in 2016 (Photo by Neilson Barnard/Getty Images for Jaguar Land Rover)
Katy Perry in 2005 (Photo by Phil McCarten/Getty Images)
Katy Perry in 2016 (Photo by Matt Winkelmeyer/Getty Images)
Biggest Celebrity Transformations
