London, UK - Prince William has received his first dose of Covid-19 vaccine and thanked National Health Service workers. But fans of the royal can't take their eyes off his toned arms!

On Thursday, the Kensington Palace's official Twitter account shared a picture of the 38-year-old prince receiving his first vaccine from a member of staff from the UK's National Health Service (NHS).

Along with that, the post reads, "On Tuesday I received my first dose of the COVID-19 vaccine. To all those working on the vaccine rollout - thank you for everything you’ve done and continue to do."

Aside from the good news that the Queen's grandson is setting an example by getting the Covid-19 vaccine, it is actually William's arm that sent royal fans into a frenzy.

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"Pardon me, Prince William, do you have a license to operate those guns?" one user wrote. Another quipped, "I bet when he heard there was going to be a vaccination and vaccination photos, he said 'Kate, we're not doing anything but working on our upper arms from now on!'"

Bulging biceps or not, the Duke of Cambridge should now be extra-safe when it comes to the virus, especially since he had already previously contracted Covid-19 in April of last year.

Kensington Palace has not yet revealed whether William's wife Kate has also been vaccinated.

Normally, information about the health of the royals is considered a private matter, but in the case of Covid-19, the British royal family has made an exception.

To encourage their subjects to get vaccinated against Covid-19, Prince Charles and his wife Camilla received their first shots of the vaccine back in February.

Queen Elizabeth II and her husband Prince Philip, who passed away in April, were vaccinated in January.