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The singer expressed her frustration that Ruth Lorenzo was voted off the show last Saturday instead of the 17-year-old.
"Ruth was my favourite – really Vickers should have gone. I felt the whole thing was a bit of a farce," she told Radio 1.
"When she didn't sing on Mariah Carey week she should have had to come back the next week and sung a Mariah song as well as a Best Of British song.
"Then it would have been fair. I don't think that Diana is very... good."
Allen concluded her comments by claiming that Vickers would be a suitable candidate for the Eurovision Song Contest.
"Diana's good enough for Eurovision!" she said. "I'm a nice person really, I just don't like Diana Vickers!"
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