These days, every famous person is friends with every other famous person, and we get stark and mostly-inexplicable reminders of that every day. So here's today's: On Saturday night, at a benefit show in New York, St. Vincent's Annie Clark and Sleigh Bells' Alexis Krauss joined Cyndi Lauper onstage to sing "Girls Just Wanna Have Fun," while Rosie O'Donnell played ...