Kitty looks beautiful at the ball Oblonsky is holding, and she's having a good night.
She dances with the best dancer there, a married man named Korsunksy who is the master of ceremonies. The two of them dance over to Anna.
Kitty wanted to see Anna wearing lilac, but instead Anna is stunning in a black dress trimmed with Venetian lace. Kitty realizes that Anna could never wear a showy color like lilac, because Anna never seeks to stand out in a crowd according to her dress.
Korsunksy asks Anna to dance, but she refuses. Then Vronsky comes over and bows to her. Anna quickly accepts Korsunksy's offer of a dance.
Kitty wonders why Anna deliberately ignores Vronsky's bow to her.
Vronsky is obviously distracted too. He forgets to ask Kitty to dance, and she looks at him with obvious surprise, until he remembers himself and asks her.
Vronsky and Kitty embrace each other as they prepare to waltz, and Kitty gives Vronsky an incredibly loving glance. It's not returned.