Ellen DeGeneres Hosts 12-Year-Old YouTube Sensation Greyson Chance

Greyson Chance, a 12-year-old pianist and songwriter has become a YouTube star for his version of Lady Gaga's "Paparazzi," and Ellen tracked him down and flew him to Los Angeles to be on her show.

On Thursday's "Ellen DeGeneres Show," Chance tells the talk show host about his sudden rise to stardom on YouTube, and he receives a surprise phone call.

Check out his interview and performance in the video, and watch the entire interview on today's "Ellen."