Marisa Tomei joined Emma Roberts at Smashbox Studios in West Hollywood yesterday, to celebrate the opening cocktail party hosted by the British Fashion Council for the London Show Rooms.

The actress wore a Peter Pilotto Spring 2012 ¾-sleeve dress.

Her ocean-inspired printed crepe dress with crystal-embellished details and a scuba-style zipper was teamed with simple nude pumps.

Rightly so, because this amazing dress should be the focus.

With her hair nonchalantly thrown over one shoulder, Marisa completed her look with neutral makeup and glossy pink lips.

You can buy Marisa’s Peter Pilotto dress from Net-A-Porter.com.

Credit: Style.com & Getty