The "That's So True" singer walked the red carpet at the Grammys in a look that would have been just as at home at a wedding ceremony ... a custom chiffon dress from Chanel, which she paired ...

In total, the dress took 350 hours to make – showing the high level of craftsmanship required to create the couture design. The gown was the perfect choice for Knightley, who wore Chanel for her ...