This Ariana Grande photo contains
demoiselle d'honneur and demoiselle d’honneur.
There might also be
robe de cocktail, gaine, robe, robe de dîner, formel, robe de soirée, and formelle.
This is the audio for Grande's song "Boyfriend Material". The song was leaked online last year. She originally recorded this for her debut album "Yours Truly", but it did not make the final track listing.