Rebecca Romijn is by far one of the sexiest women on the planet and will forever be known as a geek goddess for her role in the 'X-Men' franchise. Throughout the trilogy, kickstarted by Bryan Singer, Romijn played the slippery and deadly hench-woman of Magneto, Mystique, a mutant capable of shapeshifting into any person she laid eyes on.

Being that the popular comic book character is blue, this role required extensive makeup work. Said special makeup designer Gordon Smith:

The makeup is a very, very difficult thing for Rebecca to go through. It started out as a 10-hour makeup, then we got it down to a six-and-a-half-hour makeup on ['X-Men'], and on ['X2'] we've gotten it down to four-and-a-half hours. There are four girls working on her full time with no real break, and then when she's done, she's being touched up all day long.

The above left image shows Rebecca Romijn in 2003 around the premiere date of 'X2,' while her Mystique transformation from 'X2' is shown on the right.