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The Years & Years frontman, 33, made the announcement during Saturday's live final of Strictly Come Dancing as the audience cheered along.
Olly Alexander has promised that his Eurovision show will be a 'wild ride' as he gave the first details of his plans to represent the UK at the music competition next year.
Years & Years frontman Olly Alexander has confirmed he will represent the UK at next year's Eurovision Song Contest in Sweden.
BBC bosses are no doubt hoping to turn the UK's fortunes after Mae Muller failed to impress audiences earlier this year at the contest in Liverpool where she finished second from last.