As the royal baby watch heightens, Prince Charles and his wife Camilla joined Kate Middleton's family at a concert to celebrate the 60th anniversary of Queen Elizabeth's coronation.

Carole and Mike Middleton were joined by Pippa Middleton and her brother James as they sat in the royal box at a concert at sundown in the back garden of Buckingham Palace.

The evening began with the national anthem being sung by opera star Dame Kiri Te Kawana. Later, songstress Katherine Jenkins and classical singer Russell Watson were set to perform.

Pregnant Kate, 31, who is due next week, is believed to be resting at home at Kensington Palace's Nottingham Cottage.

There was a false alarm Wednesday when an emergency helicopter arrived to the Kensington Palace. The nation went into frenzy thinking Middleton was having the baby.

Evening Standard, a London newspaper, confirmed the reason for the emergency alert.

"Kensington palace helicopter and ambulance 'categorically' NOT royal baby, say London Ambulance. Woman ill and person broke collar bone," the publication tweeted.

Photographers and other members of the media started setting up camp outside St. Mary's Hospital a full 11 days before the Duchess' anticipated due date, and plans to commemorate the future heir's arrival have been announced by companies and countries all over the world.

The Royal Mint, for example, said last week that babies born in the U.K. on the same day as Middleton's bundle of joy would be eligible to receive one of 2,013 free lucky silver pennies.