(L-R) Taylor Swift, Jon Bon Jovi and Prince William, Duke of Cambridge sing on stage at the Centrepoint Gala Dinner at Kensington Palace on November 26, 2013 in London, England. (Getty Images)
(L-R) Taylor Swift, Jon Bon Jovi and Prince William, Duke of Cambridge sing on stage at the Centrepoint Gala Dinner at Kensington Palace on November 26, 2013 in London, England. (Getty Images)
(L-R) Taylor Swift, Jon Bon Jovi and Prince William, Duke of Cambridge sing on stage at the Centrepoint Gala Dinner at Kensington Palace on November 26, 2013 in London, England. (Getty Images)
(L-R) Taylor Swift, Jon Bon Jovi and Prince William, Duke of Cambridge sing on stage at the Centrepoint Gala Dinner at Kensington Palace on November 26, 2013 in London, England. (Getty Images)
(L-R) Taylor Swift, Jon Bon Jovi and Prince William, Duke of Cambridge sing on stage at the Centrepoint Gala Dinner at Kensington Palace on November 26, 2013 in London, England. (Getty Images)
Prince William, Duke of Cambridge (R) and Jon Bon Jovi onstage after performing together at the Centrepoint Gala Dinner at Kensington Palace on November 26, 2013 in London, England. (Getty Images)