Chappell Roan delivered a phenomenal headlining set at Elton John's annual Oscars after-party, where the pop icons teamed up onstage.

Chappell Roan sang at Elton John's Oscars AIDS benefit, singing 'Your Song' and dueting on 'Don't Let the Sun Go Down on Me' and 'Pink Pony Club.'

There were two very VIP guests at the 33rd Elton John AIDS Foundation Oscars viewing party on Sunday night. The Rocket Man’s sons — Zachary, 14, and Elijah, 12 — with husband David Furnish made a rare appearance at the annual affair held at the Pacific Design Center in West Hollywood.