The Queen Consort’s son, food critic Tom Parker Bowles, arrived early to be part of the congregation at the event.
Reality TV star Bear Grylls was photographed arriving at the ceremony in a mourning suit, with his OBE medal pinned to his lapel.
Sophie Winkleman, the actor best known as Big Suze in the sitcom Peep Show was in attendance.
She is married to Lord Frederick Windsor, the son of Prince Michael of Kent who is a paternal cousin of The Queen.
She was seen walking into the church wearing a black wide-brimmed hat featuring a matching black bow on the front, before taking her seat alongside other relatives of the late monarch.
Killing Eve star Sandra Oh was also in attendance. The Canadian actor attended the late British monarch's funeral as part of the Canadian delegation as a member of the Order of Canada.
Watch: Sandra Oh attends the Queen's funeral
Coronation Street star Antony Cotton, who was awarded an MBE in the 2022 Birthday Honours for services to the British Army, personnel and veterans, revealed he had attended the service.
Well…where to begin?! I had the greatest honour of being invited to Her Majesty’s funeral. So proud to see so many pals working on it, and doing their Queen and country proud. It was a day I will never forget.
“May flights of Angels sing thee to thy rest…” pic.twitter.com/Hjh8jTMlBl
— Antony Cotton (@antonycotton) September 19, 2022
The actor, who has played Sean Tully on the ITV soap since 2003 and is a patron of Help For Heroes, described it as 'the greatest honour', and paid tribute to the military personnel involved in the day: "The men and women of our armed forces were nothing short of magnificent today. I’m so, so proud of all my pals who worked on giving Her Majesty such a wonderful send off. It was a remarkable service."
Carole and Michael Middleton, parents of the Princess of Wales, were among the invited guests to attend the church.
Read more: Global dignitaries arrives for state funeral
Government officials and politicians have also arrived at Westminster Abbey ahead of the Queen’s state funeral.
Labour leader Sir Keir Starmer arrived at Westminster Abbey shortly before 9.40am, soon followed by London Mayor Sadiq Khan and his wife Saadiya.
Former prime ministers Boris Johnson, David Cameron and Theresa May arrived at Westminster Abbey at the same time on Monday morning.
Johnson was accompanied by wife Carrie, while May was with husband Philip and Cameron walked in with wife Samantha.
Moments later former Labour prime ministers Gordon Brown and Tony Blair walked into the church, alongside wives Sarah and Cherie respectively.
Business Secretary Jacob Rees-Mogg arrived shortly before 9.30am, wearing a black top hat, while Cop26 President Alok Sharma walked through the doors a few minutes later.
SNP Westminster leader Ian Blackford also entered the abbey, wearing a kilt.
Other politicans to arrive included former Conservative Party leader William Hague and Leader of the Commons Penny Mourdant.
Among the famous guests who will be at the funeral is composer Andrew Lloyd Webber, who paid tribute to the Queen on the BBC earlier.
Foreign dignitaries have also been greeted at Westminster Abbey ahead of the Queen’s state funeral on Monday.
US President Joe Biden and First Lady Jill Biden walked through the doors shortly after 10am.
The funeral was broadcast live at around 125 cinemas and several cathedrals in the UK, and on a big screen in Holyrood Park in front of the Palace of Holyroodhouse, Edinburgh.
At 12.15pm, the coffin was taken in procession from Westminster Abbey to Wellington Arch and then travelled to Windsor.
The hearse will then travel in procession to St George’s Chapel at Windsor Castle via the Long Walk, after which a televised committal service will take place in St George’s Chapel at 4pm.
The Dean of Windsor will conduct the service, with prayers said by the Rector of Sandringham, the Minister of Crathie Kirk and the Chaplain of Windsor Great Park.
Additional reporting by PA.
Watch: Crowds gather in London ahead of the funeral