Task: Sentence Expansion
Input (English): Rebecca Black ( born June 21 , 1997 ) is an American pop singer who gained fame for her 2011 single , Friday .
Output (English): Rebecca Renee Black ( born June 21 , 1997 ) is an American YouTuber and singer who gained extensive media coverage when the music video for her 2011 single " Friday " went viral on YouTube and other social media sites .