The gorgeous Blake Lively is known as much for flowing tresses as she is her impeccable sense of style, so we were a little surprised this morning to see that she’s dyed those beach blonde waves red. Red!

Appearing at the Times magazine 100 Most Influential People party last night, she debuted her brand new ‘do on the red carpet with a mane to match, showcasing inches of full, bouncy, auburn waves. 

Red locks are quite the rage at the moment, it appears, having been spotted on the heads of Rihanna and Cheryl Cole, so was it just a matter of time before Blake embraced the look?

Unlikely. Apparently her new hair is for a film role as Glinda the Good Witch in the upcoming Oz: The Great and the Powerful movie, which would explain those rumours a while back, too (though teamed with her turquoise Zuhair Murad gown and towering Louboutins, she’d be equally suited for the role of Ariel, we reckon).

Film roles aside, we’re unsure whether this racy colour suits Blake. It’s a bit too dramatic for her relaxed style and makes her look old beyond her years. Fingers crossed she’ll swap back to blonde after the film.

Whatever will Karl say? What do you think about Blake’s new hair? Would you ever dye your hair a dramatic colour? As always, your thoughts below, please…