The last episode has already been shot and will be telecast Jan 26.
Lewis has choreographed the act along with 42 students to make the grand finale even grander. These students were selected by Lewis from different academies, said a statement.
Amitabh was enthralled by the performance and congratulated the children and their master, Lewis for putting together a brilliant act.
The sixth season of the show went on air Sep 7 last year and during the show, Kashmir-based Manoj Kumar Raina won Rs.1 crore, while Mumbai-based home tutor Sunmeet Kaur Sawhney walked away with the bumper prize of Rs.5 crore. She is the first woman to win the big prize on the show so far.