Britain's Got Talent 2013 winners Attraction have already completed their Royal Variety Performance routine.
The group of Hungarian shadow dancers wowed in this year's series from their first audition through to the final, where they easily topped the public vote.
Now Attraction are preparing for their spot on the Royal Variety show, which apparently will be themed around the Royals and the birth of Prince George.
Writing on the group's Twitter account last month, Attraction leader Zoltan Scuzs said: “The Royal Baby has been born!
“We would like to express our warm congratulations on the arrival of the baby boy from the bottom of our hearts.
“Attraction Shadow Theatre would like to congratulate once again the whole family.”
However the group are keeping quiet on what they have planned for their special performance in December, which will be watched by Prince Charles.
A spokesperson for Attraction told the Daily Star newspaper: “The routine for the Royal Variety has been decided on.
“I am afraid I cannot tell you. It’s a surprise.”