Chappell Roan performed alongside Elton John and gifted him his own "Pink Pony Club" cowboy hat, plus more highlights from her set.

The 26-year-old breakout, aka the Midwest Princess, is expected to do a 45-minute set inside the starry fundraiser co-hosted by Jean Smart, Sheryl Lee Ralph, Neil Patrick Harris and David Burtka.

What better place to transform to a Pink Pony Club than Elton John's annual Oscars viewing party? On Sunday night, Chappell Roan took the stage for a full concert that included a historic duet with John of his classic "Don't Let the Sun Go Down on Me" and her hit "Pink Pony Club.