Actress Claire Danes had her perfect Cinderella moment on the red carpet of this year's Met Gala the other day, in a delicate powder blue gown by evening wear god Zac Posen. That gown alone would've slayed any competition on the night... But then Claire walked inside and everyone lost it. This my friends, is one of those iconic fashion moments we will never forget. Creating a fabric with fibre optic lighting actually woven throughout it, Posen has created an absolute masterpiece. He was one…