They've got a team on hand to make sure they're always looking their best - but sometimes Hollywood stars need to ditch the glam to land movie roles.

Plenty of our favourite stars - including Kaley Cuoco, Ryan Reynolds, Anne Hathaway and Jennifer Aniston - have undergone complete transformations for their pay cheque.

Some of the changes were real, others were made using clever behind-the-scenes tricks like prosthetics, but either way - the results are staggering.

To check out some of the most dramatic makeovers (or makeunders), see below:

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Ryan Reynolds in Just Friends (2005)

Anne Hathaway in Princess Diaries (2001)

Charlize Theron in Monster (2003)

Jennifer Aniston in Cake (2014)

Javier Bardem in Skyfall (2012)

Jared Leto in Chapter 27 (2007)

Emma Thompson in Nanny McPhee (2005)

Kaley Cuoco in Burning Bodhi