Ariana Grande Brings Out ‘Wicked’ Co-Star Cynthia Erivo for ‘For Good’ and ‘Get Happy/Happy Days Are Here Again’ at London Concert

Ariana Grande brought out Cynthia Erivo to perform at her Aug. 16 Eternal Sunshine tour stop at London’s O2. The “Wicked” stars sang “For Good” and “Get Happy/Happy Days Are Here Again” on the second night in the U.K. for Grande’s tour. The medley of the two “Happy” Great American Songbook standards was first done…