British songstress Leona Lewis has been tapped to sing the theme song for James Cameron's much-hyped sci-fi film "Avatar." The "X Factor" champ has recorded "I See You" for the closing credit of the movie.

Lewis, 24, worked with producers James Horner and Simon Franglen, who both produced the "Titanic" hit track "My Heart Will Go On."

The new song is expected to hit the same level of popularity the Celine Dion track achieved in 1997.

"Avatar" is being plugged as a breakthrough in filmmaking technology. It tells the story of an alien race defending their land against human invasion. Sam Worthington, Zoe Saldana, Michelle Rodriguez, Giovanni Ribisi, and "Alien" star Sigourney Weaver lead the cast.

It will be released December 16.