Alizée posted some photos today with captions indicating that she (and Gregoire) will be dancing at this production. Seems that they will be a part of a group dance with some of their DALS friends.
(this is my interpretation, subject to change)
http://www.tf1.fr/stars-80/news/star...1-8602002.html
EDIT...
Alizée and Gregoire danced today with two other couples from DALS in the background while Francois Feldman sang
Les Valses De Vienne.
At this moment, I'm able to watch the replay at TF1 here:
http://videos.tf1.fr/stars-80/replay...i-8605174.html
There are two HD captures, one from the beginning of the show which is some type of introduction that Alizée appears in, and also one of the song performance where she is dancing with Gregoire. These were captured by firstseb, and the download links are in the .txt file, attached to this post.