Uh oh. Did someone forget to read up on their wedding etiquette?
Naomi Campbell was one of the many fashionable guests attending Prince Albert and Princess Charlene of Monaco's royal wedding this weekend.
At the ceremony she looked fab in an Alexander McQueen floral embroidered gown, but it was at the gala dinner where the biggest crime against fashion was committed.
Naomi arrived at the Opera terraces in a WHITE Givenchy Couture gown.
Last time we checked she wasn't the bride, so this is a huge no-no and kinda tacky.
What do U think???
[Image via Getty Images.]