'Oz the Great and Powerful': Mila Kunis goes on f-bomb tirade at London premiere

Mila Kunis was looking every bit the wicked witch at the "Oz the Great and Powerful" premiere in London. Kunis joined co-stars James Franco, Michelle Williams and Rachel Weisz to walk the red carpet at the Empire Leicester Square.

But something -- or someone -- set Mila off into a tirade that saw her dropping the f-bomb on one of her handlers. Entertainmentwise posted video of the profanity -- in slow-mo of course, along with accounts from bystanders.

Fans on the carpet say Mila was all smiles until one TV host went over the top with his flirtations. Of course there's no way of knowing if that's what made Mila snap, but she sure didn't look happy.

Browsing through images from the premiere, it's hard to find any of Kunis smiling. Here's her hoping her weekend starts looking up.

"Oz the Great and Powerful" hits theaters March 7, so you can check out Mila's sourpuss in 3-D.