Astar's uncanny take on 'Gloomy Sunday', another standard by the legendary jazz diva, blew away the judges at the start of the show in March, before becoming a YouTube hit. Her performance won 46 percent of the vote, leaving little competition for the 500,000 kroner ($80,000) prize.
Astar was brought to tears when the presenter Solveig Kloppen announced that she had won.
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"Thank you to everyone who voted for me and thank you to Grandma," she said with tears running down her cheeks.