Actor Ian McKellen said he was euphoric after receiving his first dose of the Pfizer Covid-19 vaccine and urged everyone who was offered the jab to accept it.
The British National Health Service (NHS) posted several pictures of McKellen, in a blue T-shirt and a rainbow striped scarf, giving a thumbs up as he received the shot.
"It's a very special day. I feel euphoric," McKellen (81) said in an NHS post which he shared on Twitter.
"I would have no hesitation in recommending it to anyone.
"I feel very lucky to have had the vaccination."
Nearly 140,000 people have received their first dose of the Pfizer vaccine in Britain since roll-out began on December 8.
People aged over 80 are in the highest priority group.
A star of British stage and screen since the 1960s, McKellen attained a new level of global fame in the 2000s when he appeared as Gandalf in the Lord of the Rings movies.
He was the latest British celebrity to go public about receiving the vaccine, part of a collective effort to reassure members of the public who may be harbouring doubts about the jab's safety.
The chef and cookery writer Prue Leith (80), who presents The Great British Bake Off also posted a picture of herself on social media receiving the shot.
It is not known whether Queen Elizabeth (94) and her husband Prince Philip (99) have had the vaccine yet.
The Times reported they may "let it be known" once they have.
The queen is highly respected in Britain and her backing would be a powerful message to counter anti-vaccination misinformation.