During an appearance on The Graham Norton Show on Friday, the pop superstar admitted she wasn't sure if the proposal was legitimate because the entrepreneur asked her on April Fool's Day. "He proposed on April 1st, and I thought he was joking.” Gaga then acknowledged that she accidentally revealed their engagement during the Olympics in July. "Then when we went to the Olympics, we were filmed saying hello to the Prime Minister and I was caught on camera saying, 'This is my fiancé,' I had wanted to keep it a secret!"