This week the ladies opted for bejeweled necklines and the classic sailor stripes. We love the way these celebs made these wardrobe staples one-of-a-kind.

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Amanda Seyfried, Kathryn Erbe and Michelle Rodriguez all wore statement necklaces to events this week. Photos: Getty (3)

NECK AND NECK:

Actress Amanda Seyfried added a bit of shine to her burgundy Lanvin frock with a Tom Binns layered necklace to the premiere of "Red Riding Hood" on March 7 in Hollywood, California.

Donning the same dress she wore to the 2010 Academy Awards Kathryn Erbe walked the red carpet at "Can You Spare A Dime?" presented by Atlantic Theater Company's Annual Spring Gala at in NYC on March 7. The "Law & Order: Criminal Intent" actress added a statement choker with glittering beads.

A chunky necklace was a great finish to Michelle Rodriguez's one-shouldered black gown at the premiere of her latest flick, "Battle: Los Angeles" on March 8 in Los Angeles, California. Minimal makeup and loose waves complete her glam look.

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Sienna Miller, Katy Perry and Tina Fey all look graphic and chic in stripes. Photos: WireImage | Getty Images (2)

AHOY!

Sienna Miller
is always on trend, which is why it is no surprise that she was the epitome of cool in a knitted Topshop sweater and skinny jeans while out on the town in London.

Katy Perry was perched at the front row of Jean-Charles de Castelbajac's ready-to-wear show during Paris Fashion Week at on March 8. The Teenage Dream wore a floor-length striped dress, and bright blue wig and brought a fan with the words "Air Conditioning" printed on it.

Funny girl Tina Fey was on hand for the 20th annual Bunny Hop hosted by Memorial Sloan-Kettering Cancer Center at FAO Schwarz on March 8 in New York City. The "30 Rock" star kept it simple with a striped tee-shirt, black pencil skirt and pointy-toe heels.

For more celeb copy cats, check out last week's trends.