Where? During a state visit to Berlin, Germany
What? The Princess of Monaco - accompanying her husband, Prince Albert II of Monaco - went all out for a state dinner in Berlin last night, arriving in an utterly elegant gold brocade gown.
Unfortunately for Charlene, Daniela Schadt, the partner of the German President, had also opted to wear a golden gown for the evening - hers a lace-sleeved taffeta ball gown.
We're assuming the colour co-ordination wasn't intentional, as Daniela later made her feelings about the style snap well and truly clear...
Well, it's a brave woman that goes up against Princess Charlene in a fashion battle and comes out fighting.