Rita Ora took the plunge...into a vat of blue hair dye.

The normally bleach blonde Brit singer had a serious Katy Perry moment today, tweeting "Today it's smurf day :)" and posting this picture:

RELATED: 15 of Rita Ora's Coolest Hairstyles

How long will her blue period last? Well, she used the hashtag #bluehairday, which implies it has a 24 hour expiration date. Too bad—we kinda think it's smurftastic.

What do you think of the new 'do? Don't?