Prince William has royal fans "blushing" over a picture of him receiving his COVID-19 vaccine.
The 38-year-old uploaded a snap of himself with his sleeve rolled up and a needle in his arm to the Duke and Duchess of Cambridge's Instagram page on Friday.
"On Tuesday I received my first dose of the COVID-19 vaccine," he captioned the image. "To all those working on the vaccine rollout - thank you for everything you’ve done and continue to do."
But it wasn't the jab that caught social media's attention, rather his toned upper-arm stole the show with royal fans buzzing over his buff bicep.
"Wasn't expecting a gun show this early but happy I got an invite," one Instagram user wrote.
"That bicep though!"
"Wow, didn't realise Prince William had such well-defined arms!!"
Others put their admiration a little more simply: "I'm blushing."
"What a babe."
"Suns out, guns out, hubba hubba!"
For some, the shot confirmed how lucky the Duchess of Cambridge really was.
"Check out the arms! Our Kate's a lucky lady."
"No wonder the Duchess of Cambridge always looks so happy," said another.
While others gave her a word of warning: "Kate come get your man, the girls are thirsty."
However other Instagram users were more perplexed at how the prince was able to roll his long-sleeve right up to his shoulder: "Did he just roll his long sleeve up to the shoulder? How?"
"How did you manage to roll up your sleeve like that?"
It was revealed in November the Duke of Cambridge tested positive for COVID-19 in April 2020.
He caught the virus just days after his father Prince Charles tested positive in March.
A source told The Sun Prince William was "struggling to breathe" while sick and decided to keep his diagnosis private to avoid sending the country into a panic.
"William was hit pretty hard by the virus - it really knocked him for six," the source told The Sun.
"At one stage he was struggling to breathe, so obviously everyone around him was pretty panicked."
Other members of the Royal Family such as Prince Charles, Camilla and the Queen have also received their vaccines.
During a video call with health leaders from around the world, the Queen said the COVID-19 vaccine was "very quick" and "didn't hurt at all". She encouraged those hesitant about receiving the vaccine to "think about other people rather than themselves".