The “Shallow” singer closed out the star-studded benefit concert with a song she co-wrote for the show with her fiancé, Michael Polansky.

In a night full of surprises, a reunion of Nirvana — fronted by St. Vincent, Kim Gordon and Joan Jett in the place of the late Kurt Cobain — topped the list.

Mikael Wood and August Brown are at Inglewood's Intuit Dome and Kia Forum for the FireAid benefit concerts starring Billie Eilish, Lady Gaga, Green Day and Stevie Wonder, among many others.

Meanwhie, a whole host of other performances came from stars including Lady Gaga and Stevie Wonder. Green Day and Billie ...