Scuba shabby chic, a matronly mess and an homage to "Sharknado" -- stars are rocking all the wrong trends this week!

Rita Ora stepped out on the red carpet at the Michalsky Style Night in Berlin, Germany this week, sporting an all-black ensemble that looked like a wet suit with a tutu attached.

While we don't mind the high neckline, the baggy shape fails to show off the singer's sexy silhouette. The British beauty also should have paired the delicate tutu with sandals instead of those pointy pumps.

Cameron Diaz landed on our worst dressed list this week for donning a frumpy watercolor-print Vionnet wrap dress to the New York screening of "Sex Tape" on Monday.

The 41-year-old actress usually shows off her enviable bod, so we were shocked when she showed up in this matronly dress. Time to bring back the classic LBD!

Tara Reid seemed to be inspired by her movie, "Sharknado," when she chose to wear this asymmetrical blue tie-dyed mini to NBC Universal's TCA Press Tour on Tuesday.

It looks like a shark took a bite out of the middle of the "American Pie" star's disastrous dress.

But, these ladies weren't alone -- click "Launch Gallery" above to see more of this week's worst dressed stars!

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