This is a thing that actually happened. There is video.
On Monday night, Prince William hosted the Winter Whites Gala in aid of youth homelessness charity Centrepoint.
AP Photo / Dominic Lipinski, Pool
The highlight of the event was a concert headlined by Jon Bon Jovi and Taylor Swift (the first ever live concert at the palace).
AP Photo/PA, Dominic Lipinski, Pool
"I'm absolutely excited. I don't think I've ever played at a palace before so it is really wonderful," Swift gushed.
Pool / Reuters
During Bon Jovi's final set, he encouraged the future king of England to come up on the stage and sing "Livin' On A Prayer" with him. Prince William agreed on the condition that Swift join in as well.
Dominic Lipinski / PA Photos / Landov