Cynthia Erivo joins Ariana Grande to perform 'For Good' in London

Cynthia Erivo joined Ariana Grande on stage in London for a surprise performance of "For Good" during Grande's Eternal Sunshine Tour.

The Wicked co-stars performed the song at Grande's show at London's O2 Arena. "For Good" is the titular track from last year's sequel film Wicked: For Good, in which Grande and Erivo reprised their roles as Glinda and Elphaba.

The pair also performed a medley of "Get Happy" and "Happy Days Are Here Again" during the appearance.

The performance comes after Grande announced earlier this month that she would take a "step back" following the tour.

Grande later clarified her decision while speaking to fans during a show in Chicago.

"It was something that I have decided," she said. "A plan that I had quietly made a long time ago. It was a decision that was made from a thoughtful and empowered place."