Hermione noticed much to her annoyance that Ron had brought Lavender Brown with him. She hadn’t seen Lavender since the battle of Hogwarts and rationally she had nothing against Lavender at all, it’s just that she knew Ron was only doing it to make her jealous. Ron dated Lavender briefly in sixth year, but he only did that because she flung herself at him. If she heard "Won-Won’ come out of her lips tonight she might scream.