The rule is that it's rude for a female guest to wear white to a wedding, the only possible exception being if the outfit won't take away from the bride by being too sexy and as long as it doesn't look anything even remotely like a wedding dress. Needless to say, Lindsay Lohan went to Kim Kardashians wedding in a white dress that from the back and side looked like a wedding dress but with the front cut real low to show off her tits.
So take that, Kim Kardashian! That's what you get for inviting Lindsay somewhere! What made you think she might follow the laws of etiquette any more than she does the ones of society.
(image source = akm)