Despite Jay-Z's recent declaration to Rolling Stone that no guests would be joining him for his inaugural eight-night stand at the new Barclays Center stadium in Brooklyn, he shared the spotlight with at least one V.I.P. during Saturday night's closing concert: his wife. Beyoncé, dressed for the occasion in a Nets ballcap, took the stage for three songs, beginning with "Diva" before Jay-Z returned to duet with her on "Crazy in Love" and, at the end of the show, "Young Forever."