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"A video of a 4-year-old boy singing a Bruno Mars song on Ellen has gone viral. The clip of Kai Langer serenading DeGeneres with his favourite song &amp;#039;Grenade&amp;#039; has been viewed over 200,000 times since it was uploaded yesterday (March 6).      Kai was invited on to the show after his mother uploaded a video of him singing on YouTube last week (February 26). He had a short interview with DeGeneres before performing for her. He told the audience that he had previously only performed in front of three people. Kai also presented the host with a picture he had made her with a note that he had dictated for his dad to write. It said: &amp;quot;I&amp;#039;m excited to go to Ellen. You are the best Ellen in the whole wide world. I don&amp;#039;t want any other Ellen.&amp;quot; Bruno Mars heard that the 4-year-old was going to be on the show and sent Kai and his family tickets to go and see him on tour. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/fun/news/a463897/4-year-old-serenades-ellen-degeneres-with-grenade-video/>