A formal hairstyle does not have to be fancy or traffic stopping to look divine.  One shouldn’t overdo in all areas.  Keep the hairdo simple if you are going to wear earrings of size and intensity.   You could also seize this occasion to put on the dazzle where your cosmetics are concerned. 

Really laying it on to bring out your eyes with liner and shimmery eye shadow is very complementing especially if you are following the rule to accent your best feature.  Though her bold eyebrows really draw attention to them, my guess is that Keira’s eyes really came to life when her eye makeup was applied.   It’s times like these that you do want your hair to look gracious yet not accented with too much artistry for the total look would become garish.

Your guess is as good as mine as to how the back of Keira’s hairstyle might be.  She may have it in a traditional french twist, or in a more contemporary type one.  A bun may even be the choice at the nape of the neck.  Starting with a natural, haphazard part, Keira’s hair is draped over her ears as it was taken back with random tendrils pulled out along the face-line for a trendy, "messy" accent to the style.  Said hair strands may have a little hair wax applied to ends for marked definition or curled with an iron for a slight few seconds having been spritzed to hang freely. 

Ms. Knightley is beautiful and looks great in this simple hair design that she elegantly pulls off.  Keira is up for an Oscar nomination for Best Performance by an Actress for her role in "Pride and Prejudice".  Otherwise known as the Academy Awards, the Oscars will be televised Sunday evening, March 5th.  Good Luck Keira !