Gwyneth Paltrow and Madonna
Though Gwyneth Paltrow and Madonna have been friends since the late '90s, both stars have reportedly gone their separate ways. A source close to the women claimed that they had "a major falling out" in 2010. The insider told Us Weekly that, "They don't speak," adding, "I can't tell you exactly why they had the falling out, but Gwyneth can be jealous and competitive."
Without naming any names, Gwyneth told Vogue UK in May of that year: "I'm having a situation right now with a friend where I'm feeling pretty angry."