Vedette is a French word for a star or headline performer, so the phrase works as a tongue-in-cheek greeting for someone behaving like a celebrity. Short voice clips like this one circulate on soundboards because they are easy to drop into edits, memes, and reaction videos without much setup. The humour comes from the contrast between the polite question and the implied teasing, and because the line is short and instantly recognisable in tone, creators keep reusing it whenever a moment calls for a playful spotlight on one person.