When we heard Rachel McAdams was in "About Time," her third movie about time travel, we were sure that this time, she'd be the one skipping through the centuries. After all, she's paid her dues. In "The Time Traveler's Wife," she played a wife often left in the lurch by her time-traveling husband. Her "Midnight in Paris" role, as the fiancée (turned ex-fiancée) of a time-traveling writer, left her similarly stranded.

But even though it's McAdams' turn to hop in the ol' time machine, her latest film, "About Time," keeps her firmly planted in the present.

"It's pretty unfair," said McAdams, half-jokingly, to APP. "I've now done three films with time travel in them and I've not gotten to time travel once so I'm kind of bitter about that."

Of course, it could be argued that McAdams has compensated for her lack of linear time defiance just by looking like she's jumped through time. Based on the frequency with which she changes her hair, and the fact that she consistently plays characters a decade younger than her actual age,, we would argue that McAdams defies time on-screen and in real life. From her late 1800s look in "Sherlock Holmes" to a pink-streaked ultra-mod bob on the red carpet, see how this style chameleon has hopscotched through the decades -- in just a matter of years.

McAdams first made it on to the big screen in 2002's "The Hot Chick," looking fresh-faced and innocent with shoulder-length blonde layers.

She rocked stick-straight blonde hair for 2004's "Mean Girls," because nothing says "I'm a mean girl" more than long blonde hair and a pink mini skirt.

McAdams' character Allie and her perfectly put-together hair stole our hearts in 2004's "The Notebook."

The actress showed up to the June 2004 premiere for "The Notebook" incognito with bangs, a choppy bob, and chocolate brown hair color.