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Claim to fame: "Britain's Got Talent""
Point of meltdown: Boyle was the "BGT" favorite, but when she didn't win, the singer reportedly suffered a breakdown and checked into a hospital. She told Oprah Winfrey in 2010, "There are two types of exhaustion, exhaustion due to ill health and exhaustion due to work. I like to be busy, so I was very exhausted because of work. But I was fine. It's a chapter of my life which is over now." SuBo quickly bounced back after the mental check, releasing two albums, "I Dreamed a Dream" and "The Gift."