Rachel arrived at the July 2005 premiere for "The Wedding Crashers" with her hair blonde and pulled back with a headband. We can't get over how much she resembles Barbara Eden from "I Dream of Jeannie" in this one. That's five different hair colors in a year so far, if anyone is counting.

...long before it covered our Pinterest boards. McAdams walked the red carpet for the August 2005 premiere of "Red Eye" with her hair in a romantic braided updo topped off with a flower.

McAdams wore her blonde hair down with lots of volume and thick side swept bangs for her August 2005 appearance on "Total Request Live."

Rachel's hair stylists wove black ribbon into her messy updo for the 2005 Teen Choice Awards.

McAdams wore her hair in long blonde layers for the Hollywood Film Festival in October 2005. She looked like she'd lived on the beach her whole life -- even though she's from Toronto.