By Hayley Spencer
Updated Feb 13, 2015 @ 9:42 am
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This might just be our favourite Dakota Johnson look to date. Rather than giving a nod to Fifty Shades of Grey’s S&M theme (or wearing, um, gray), Johnson has stuck firmly to a palette of black and white during the film's promo tour, and she didn't falter for the London premiere.

The actress channeled an ethereal, innocent vibe akin to her character, Anastasia Steele, for the Leicester Square screening, in a bright white Saint Laurent gown. The plunging gown featured delicate crystal embellishment and a slightly flowing train.

She kept her accessories to a minimum to let the dress take the limelight it deserved by simply adding a few jewels and a sleek silver Roger Vivier clutch. Following the same fail-safe beauty formula from the world premiere, Johnson wore her hair in bedhead waves with a blunt fringe and added a smoldering finish with a matte magenta lip.

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The leading lady was joined on the red carpet by Mr. Christian Grey himself, Jamie Dornan, in a sharp navy suit-and-tie combo.

Director Sam Taylor-Johnson kept it simple in a sequin LBD and crystal embellished heels, while author E.L. James went for a screen siren look in a wrap-effect pleated silver gown. Team Fifty Shades is on a fashion roll!