believes that Figaro now prefers Marcellina to her. She has a tantrum and slaps Figaro's face. Marcellina explains, and Susanna, realizing her mistake, joins the celebration. Bartolo, overcome with emotion, agrees to marry Marcellina that evening in a double wedding (sextet: "Riconosci in questo amplesso" – "Recognize in this embrace"). All leave, before Barbarina, Antonio's daughter, invites Cherubino back to her house so they can disguise him as a girl. The Countess, alone, ponders the loss of her happiness (aria: "Dove sono i bei momenti" – "Where are they, the beautiful moments"). Meanwhile, Antonio informs the Count that Cherubino is not in Seville, but in fact at his house. Susanna enters and updates her mistress regarding the plan to trap the Count. The Countess dictates a love letter for Susanna to send to the Count, which suggests that he meet her (Susanna) that night, "under the pines". The letter instructs the Count to return the pin which fastens the letter (duet: "Sull'aria ... che soave zeffiretto" – "On the breeze... What a gentle little zephyr"). A chorus of young peasants, among them Cherubino disguised as a girl, arrives to serenade the Countess. The Count arrives with Antonio and, discovering the page, is enraged. His anger is quickly dispelled by Barbarina, who publicly recalls that he had once offered to give her anything she wants in exchange for certain favors, and asks for Cherubino's hand in marriage. Thoroughly embarrassed, the Count allows Cherubino to stay. The act closes with the double wedding, during the course of which Susanna delivers her letter to the Count (Finale: "Ecco la marcia" – "Here is the procession"). Figaro watches the Count prick his finger on the pin, and laughs, unaware that the love-note is an invitation for the Count to tryst with Figaro's own bride Susanna. As the curtain drops, the two newlywed couples rejoice. Act 4 The garden, with two pavilions. Night. Following the directions in the letter, the Count has sent the pin back to Susanna, giving it to Barbarina. However, Barbarina has lost it (aria: "L'ho perduta, me meschina" – "I have lost it, poor me"). Figaro and Marcellina see Barbarina, and Figaro asks her what she is doing. When he hears the pin is Susanna's, he is overcome with jealousy, especially as he recognises the pin to be the one that fastened the letter to the Count. Thinking that Susanna is