In "Brady Bunch" style, Fallon, Cyrus and "Late Night" studio band The Roots sing a cappella to the pop star's hit single "We Can't Stop."
There's no foam fingers, dancing bears or twerking to distract you during the jam session. It's just some good old fashion singing that showcases Cyrus' raw vocals, and it sounds really good.
This isn't the first time a pop star joined the "Late Night" funnyman. Christina Aguilera sang her single "Your Body" in November, while Mariah Carey performed the holiday classic "All I Want for Christmas" in December.