Dame Joan Collins has received a Covid booster vaccine, joking: ‘Diamonds may be forever, but the vaccine is a life saver.’The actress, 88, was pictured wearing a straw hat and jewelled necklace while doctors administered her Covid-19 and flu jabs simultaneously.Dame Joan, best known for starring in US TV series Dynasty, thanked the doctors and said she had experienced no side effects.‘Delighted to have received the flu jab and booster vaccine at the same time, and have had no side effects.