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.

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.

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.