You don't have to wear posh designer dresses to stand out in Hollywood. While Emma Roberts made a sexy scene in a designer Cushnie et Ochs  black and white look and Haute Couture's front-row stars made a splash in Dior, we were equally impressed by one style star's affordable Topshop  dress. Read on to see the looks we loved on some very chic ladies.
Allison Williams at the Dior Haute Couture Show
Allison Williams looked lovely enough to walk the runway with Dior's Haute Couture designs while sitting front row at the show.
Lupita Nyong'o at the Producers Guild Awards
Lupita Nyong'o made a departure from her more colorful red carpet looks while attending the Producers Guild Awards in Stella McCartney .
Keira Knightley at the UK Jack Ryan: Shadow Recruit Premiere
A sweet set of bowed heels added feminine flair to Keira Knightley 's black silk crepe Proenza Schouler  dress at the London premiere of Jack Ryan: Shadow Recruit.
Emmy Rossum at the Elle Women in Television Celebration
Emmy Rossum gave us definite reason to tune in while wearing J. Mendel's blush confection at Elle's Women in Television Celebration.
Emma Roberts at the Elle Women in Television Celebration
Sticking to the cutout theme but taking a sexier route, Emma Roberts heated up the Women in Television event wearing Cushnie et Ochs .
Kate Bosworth at the Dior Haute Couture Show
At Paris Couture Week, Kate Bosworth  drove us mad for designer plaid.
Imogen Poots at the Screening of That Awkward Moment
At the New York screening of That Awkward Moment, Imogen Poots was anything but awkward in her ripped-from-the-runway Louis Vuitton  design.
Sarah Jessica Parker at the New School University Center Grand Opening
Fittingly, Sarah Jessica Parker made her shoes  the real star of the evening when she helped open the New School University Center in embellished boots.
Anna Kendrick at the Delta Air Lines Grammy Weekend Reception
Anna Kendrick 's bright, floral, $136 Topshop  dress was worth every penny at Delta's pre-Grammy Awards bash.
Diane Kruger at the Sundance Film Festival
Diane Kruger  gave her ladylike look a twist with a Chloé blouse while attending Sundance for The Better Angels.