Mmmmh, Prince William in Scrubs
The Duke of Cambridge observed surgery at the Royal Marsden Hospital
During the engagement, Prince William observed two operations - the removal of a bladder tumor and breast reconstruction. He was shown microscopic instruments and spoke with the surgeons about what they do and how long the procedures take.
Earlier in the day, William and the Duchess of Cambridge met with staff and volunteers from the Royal British Legion, who were selling Remembrance poppies in London.
The Duke will host a Winter Whites gala on November 26th to raise money for homeless charity Centrepoint. Taylor Swift, who will perform at the event, told the BBC how "excited" she was.
"I'm really stoked. This is the first thing I've performed at for any kind of royal engagement – very, very honored."
It appears that Swift needs a briefing on royal protocol.
"I've been asking about that," Swift said. "I think I'm really safe if I just shake hands and be polite."