Rachel McAdams Goes Platinum Blonde

Credit: Jamie McCarthy/WireImage; Tony Barson/WireImage

Blonder is the new blonde!

Just a few weeks after Emma Roberts brightened up her dark blonde hair to an almost platinum shade, another star is showing off a much lighter look.

PHOTOS: Celebs who are natural blondes

Rachel McAdams, who has has experimented with everything from red to brown to pink(!) hair, hit the 2011 Cannes Film Festival with extra-light locks.

PHOTOS: Stars who made major hair color changes

And her new hair color isn't the only thing that has people buzzing right now. The 32-year-old actress and her 42-year-old Midnight in Paris costar, Michael Sheen, made their first joint red carpet debut Wednesday at the festival.

McAdams has been turning heads with her stylish ensembles including a dramatic embroidered red silk organza illusion cap sleeve Marchesa gown and a beige sparkly bustier with wide-leg trousers.

Tell Us: What do you think of Rachel's lighter hair color?