As the men and Mimi dine at the cafÃ , Musetta , who used to be Marcello 's sweetheart , arrives with Alcindoro , an old , rich minister . As the men and MimÃ dine at the cafe , Musetta , formerly Marcello 's sweetheart , arrives with her rich ( and aging ) government minister admirer , Alcindoro , to whom she speaks as she might to a lapdog .