A loincloth dress, a gothic alien and a leopard-print jumpsuit -- stars are rocking all the wrong trends this week!

Nicole Richie showed up at the AOL NewFront event in NYC on Tuesday, sporting a studded Anthony Vaccarello dress with a hemline we haven't seen before. Super-short on the sides and dropping to two handkerchief points in the middle, this look will should be called The Loincloth Dress.

Luckily, the "Candidly Nicole"star shouldn't have a wardrobe malfunction with those cleverly-place thigh straps keeping those points from going rogue!

Just when you thought Rihanna couldn't surprise you when it comes to her outfit choices, she shows up to the first annual iHeartRadio Music Awards in Los Angeles on Thurday wearing a full-length, see-through black lace dress that showed off her black undies.

She accessorized the look with a leather jacket, cross jewelry and a very interesting hairstyle that seemed straight out of "Orange Is the New Black." Oh, did we mention the green lipstick?

And, Tia Mowry visited the 106 & Park at BET studio in New York City on Wednesday, rocking this red leopard-print jumpsuit. She tried to tone down the loud look with a black blazer and black-and-white peep-toe stilettos.

This unflattering ensemble should be used to demonstrate how NOT to wear animal prints!

But they weren't alone -- see more of this week's worst dressed stars in the gallery above.

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