A tank top with a tail, a ruched floral gown and bird feather shoes -- stars were rocking all the wrong trends this week!

Camilla Belle caught everyone's attention on the red carpet at the "Cavemen" premiere in Los Angeles -- and not in a good way.

The actress donned a black top with a flower in front and a long sweeping cape in back, paired with loose-fitted black pants that completely swallowed her petite frame.

Olivia Munn walked the red carpet at the Stockholm premiere of "Robocop," wearing a grass green Michael Kors halter dress with a white flower print. The ruched detailing down the front and the backless silhouette looked cheap -- not chic.

And, Tilda Swinton is no stranger to making a statement with fashion, but the sandals she wore at "The Grand Budapest Hotel" premiere in Berlin were a little scary. The actress looked like she killed a bird and glued its feathers on her shoes.

But these ladies weren't alone -- see more of this week's worst dressed stars in the gallery above!

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