It's the Paris Life (1954)

Cri -Cri is a singer in a cabaret ,"La Vie Parisienne ", and performs all the "hits" of the era such as "La Tonkinoise" .She attracts the attention of a young viscount but the Belle doesn't want to go out with the first to come and "besides mommy would be cross";the problem is that "mommy " is a concierge ,and ,except in fairy tales ,princes do not woo shepherdesses ,except for fun.But the noble is really in love:he passes himself off as a coach driver (and the coachman becomes a duke ).