Keira Knightley’s red carpet looks

Knightley attended the 2015 SAG Awards in a plum-colored gown by fellow Brit Erdem Moraliglu.  (Frazer Harrison / Getty Images)

The “Imitation Game” nominee wore a doily-collared Chanel gown to the 2015 Golden Globes.  (Bottom left, Frazer Harrison / Getty Images; top left, Jason Merritt / Getty Images; center, Frazer Harrison / Getty Images; right, Jason Merritt / Getty Images)

Knightley donned this pink patterned Dolce & Gabbana dress for the premiere of “The Imitation Game” on Nov. 17, 2014, in New York City.  (Larry Busacca / Getty Images)

The actress selected a sleeveless Chanel frock for a screening of “The Imitation Game” in Los Angeles on Nov. 10, 2014.  (Charley Gallay / Getty Images for the Weinstein Co.)

Knightley wore Chanel couture for “The Imitation Game” premiere at the 2014 Toronto International Film Festival in September 2014.   (Jason Merritt / Getty Images)

The “Begin Again” star wore a printed Valentino gown to the film’s New York premiere on June 25, 2014.  (Andrew H. Walker / Getty Images)

Knightley chose a little black dress by Proenza Schouler for the European premiere of “Jack Ryan: Shadow Recruit” in London on Jan. 20, 2014.  (Leon Neal / AFP / Getty Images)

The actress wore a lacy black gown from Elie Saab at the “Anna Karenina” premiere during the 2012 Toronto International Film Festival on Sept. 7, 2012.  (Jason Merritt / Getty Images)

Knightley wore a pale green, strapless gown from Erdem at the U.S. premiere of “Anna Karenina” on Nov. 14, 2012.  (Frazer Harrison / Getty Images)

The “Anna Karenina” star opted for this Chanel dress at the U.K. premiere on Sept. 4, 2012.  (Stuart Wilson / Getty Images)

Knightley turned to Valentino once again for the Venice Film Festival premiere of “A Dangerous Method” on Sept. 2, 2011.  (Vittorio Zunino Celotto / Getty Images for Lancia)

Knightley wore this eye-catching Alexis Mabille dress at the world premiere of “The Duchess” in London on Sept. 3, 2008.  (Chris Jackson / Getty Images)

Knightley slipped into a sleek Valentino gown at the 2006 Golden Globes.   (Frazer Harrison / Getty Images)

Knightley modeled this classy Roland Mouret concoction at the Toronto International Film Festival premiere of “Pride & Prejudice” on Sept. 11, 2005.   (Evan Agostini / Getty Images)

Knightley arrived at the London premiere of “Pirates of the Caribbean: Dead Man’s Chest” in a backless bronze dress from Gucci.  (Chris Jackson / Getty Images)