Duchess Catherine has paid tribute to frontline workers on her birthday

They wrote: "Thank you for your kind wishes on The Duchess’ birthday. Birthdays have been very different in recent months, and our thoughts continue to be with all those working on the front line at this hugely challenging time."

Catherine's in-laws Prince Charles and Duchess Camilla tweeted "Happy Birthday to The Duchess of Cambridge!", while Queen Elizabeth's Twitter account posted the message: "Wishing The Duchess of Cambridge a very happy birthday today! #HappyBirthdayHRH (sic)."

Meanwhile, Prince William has revealed he and Catherine talk to their children about Covid-19 every day.

The 38-year-old royal said in a video call with NHS staff from Homerton University Hospital that he and his wife speak to their kids, Prince George, Princess Charlotte and Prince Louis, every day about the work the NHS have been doing throughout the pandemic.

He said: "You're all in my thoughts and Catherine and I, and all of the children, talk about all of you guys every day.

"We're making sure the children understand the sacrifices that all of you are making."

William, who is joint patron of NHS Charities Together, added: "A huge thank you for all the hard work, the sleepless nights, the lack of sleep, the anxiety, the exhaustion and everything that you are doing, we are so grateful. Good luck, we are all thinking of you."