"Tommy used to work on the...

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royal docks"? OK, this really happened and I thought you might like to see for yourself.

On Monday night, Prince William hosted the Winter Whites Gala, benefiting his youth homelessness charity (Centrepoint).

The highlight of the event was a concert headlined by Jon Bon Jovi and Taylor Swift (the first ever live concert at the palace, in front of 600 guests).

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.