I second victoria beckham on that...This is my favourite
'Victoria Beckham has had a well-publicized feud with supermoden Naomi Campbell, which began when she publicly branded Campbell as "a massive cow" and a "biaatch" in 2000. The feud reportedly began when Naomi asked Victoria, "Why do they call you Posh?" (Victoria clearly being of common lower class blood). This was apparently responded with, "Why do they call you beautiful?" '
- answers.com