That's all I can think of. These artists have always been a positive influence on us all. Never a bad moment. They are never rude to anyone. (Disregarding Britney's breakdown period, that doesn't count; she's always known as the most sweetest person alive; pre-2004 quoted by Madonna).
My two girls Britney and Beyonce are well known for being some of the most down to earth people you'll meet. Anyone who's worked with those girls professionally had nothing but praise of how sweet and nice they were.