Rooney Mara and Other Best Dressed Celebs of the Week

Rooney's stellar red carpet run certainly has continued into the new year. Her elegant white and black dotted chiffon Fall 2011 Rodarte halter gown included a curved, bow-accented waistband along with matching trim at the hem.

Image: Sean Thorton/WENN.com

The young star preceded her floor-length Rodarte number with this crepe Louis Vuitton sleeveless little black dress, which had extensive bead embellishments. She accessorized with a black belt and Givenchy sandals.

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Rachel also attended the Madrid unveiling to support her husband, Daniel Craig. She wore a black Alexander McQueen Spring 2012 dress styled with Roger Vivier’s Pilgrim Black Crow clutch and Palace pumps.

Image: Sean Thorton/WENN.com

This white body-conscious Blumarine dress was Sofia’s attire for the event. She completed the Las Vegas look with Jacqueline Nerguizian jewelry and a nude pair of Christian Louboutin peep-toes.

Image: Vegasnews.com

The star sported several stunning looks as she counted down to 2012 alongside pal Demi Lovato. Selena’s Kristian Aadnevik Spring 2012 mini had ruffle detailing as well as gold accents and was teamed with flashy Sergio Rossi Cachet keyhole platform pumps.

Image: Hollywoodlife.com

Christina donned a gold Donna Karan frock for her appearance on the ABC talk show. She accessorized the metallic dress with a perfectly purple pair of Giuseppe Zanotti pumps.

Image: Abc.go.com/shows/jimmy-kimmel-live

Kourtney rang in the new year decked out in a black Diane von Furstenberg Ariel sequined wrap gown. The petite and pregnant reality star finished off the look with a Judith Leiber clutch, jewelry by Loren Jewels and coordinating Christian Louboutin Daffodil platform pumps.

Image: Judy Eddy/WENN.com

Ever the trendsetter, Alexa opted to wear a silver Marc Jacobs Spring 2012 jacket as a dress as she discussed her new Lifetime show, 24 Hour Catwalk. She finished off the inventive look with a pair of black tights and matching silver pumps.

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Helen went with all-over sequins courtesy of this Edition by Georges Chakra Fall 2011 black cocktail dress. Satin accents and a cut out back rounded out the sleek look.

Image: Zimbio.com

This Zuhair Murad mini was all about the hand beading. Kristen’s long sleeve dress with ruffled hemline comes from the Fall 2011 offering and was partnered with Christian Louboutin ankle-strap heels.

Image: Zimbio.com