Katy Perry in Louboutins. Photo: PA
Any fashionista knows that red soles equal Christian Louboutin. Or at least it did until Yves Saint Laurent decided to get in on the coloured sole action.
Louboutin filed a lawsuit in Manhattan's Federal Court on 7 April over YSL's spring 2011 collection which features red suede shoes with red soles.
Court papers state that: "The defendants use of red footwear outsoles that are virtually identical to plaintiff's Red Sole Mark is likely to cause and is causing confusion, mistake and deception among the relevant purchasing public as to the origin of the infringing footwear."
The offending footwear is part of a collection which also features purple shoes with purple soles, navy with navy and green with green.
What do you think? Are YSL trying to tread on Louboutin's scarlet toes?