After all, it isn't as if Pippa said "No Kate, I'm not telling you what I'm going to wear - it's a surprise!" and then walked away sniggering....
To the best of my knowledge, the bride chooses the bridesmaid dresses. OK, the bridesmaids often have a say, but the likes of that awful Liz Jones making snide remarks about Pippa "breaking rules by wearing white" just make themselves sound stupid and bitchy.