Prince William, Duke of Cambridge, right, and Catherine, Duchess of Cambridge, center, are welcomed by the Queen’s representative Deputy Lieutenant Air Vice-Marshall Clive Evans, as they arrive at the Royal Mardsen hospital in Sutton, south London, Thursday, Sept. 29, 2011. (Sang Tan/AP)

Crown Prince Frederick and Crown Princess Mary of Denmark will join the royal couple.

This trip will be the first since their stay in Canada and the United States this summer.

In other royal news, Kate beat her younger sister Pippa for “royal with the best body” in a poll conducted by Fitness Magazine. Fifty-two percent of respondents chose Kate, while 18 percent voted for Pippa.

More royal news:

Harry finds his own Kate Middleton?

“Middleton effect” doesn’t reach bridal fashion week