"C'est Noël" is a French popular song composed in 1956 by Henri Betti with the lyrics by Jean Manse.
C'est Noël was one of the four songs that Fernandel sings in the film, but the scene was cut in the editing.
So it appears only in the record released the same year with the other three songs of the film (Tout ça c'est Marseille, Quel plaisir !
The scene where Fernandel sang this song was in a Christmas night decor where Claire Diamant, who played the role of his niece Josette, was sitting on her lap.
The actress was six years old at the time of filming, which was the same age of Henri Betti's daughter.