The BBC has been left red-faced after an image of Prince William with a penis doodled on his head was shown during one of it's programmes.

Viewers were stunned when an image of the Duke and Duchess of Cambridge, with a graphic doodle on it, appeared on their screens.

The embarrassing gaffe came during a BBC Breakfast trailer for their feature on Barbershopera, a quartet made up of three men and one woman.

It broadcast the latest Barbershopera video with newspapers laid out on a coffee table in a clip from their song "I could have married Kate", which is about the royal couple' marriage.

The unedited image shows William, who recently welcomed his firstborn Prince George, with comedy glasses, moustache and the cartoon phallus on his head.

The mistake has since provoked a huge response from the online community.

"I was shocked when I was eating my breakfast this morning when I saw a penis drawn on the future king's head on BBC Breakfast. It was a surprising one," one viewer said.

Another wrote: "Guessing BBC Breakfast didn't vet the video clip before they used it this morning."

Dave Yates was less amused, tweeting: "Dear BBC Breakfast. The trail for 'Barbershopera' just showed a cartoon drawing of a penis on Prince William's head. Please be more careful."

The Beeb has since apologised for the blunder.

"This image was shown fleetingly within a comedy promotional video for Barbershopera, a humorous barbershop group, who were appearing later on in the programme," a spokeswoman said.

"The material was provided by Barbershopera but we failed to spot the offending material within it. We apologise for this."