A Service of Thanksgiving for the Queen's Platinum Jubilee at St Paul's Cathedral is underway, with members of the Royal family pictured signing hymns inside the church.
Members of the Royal Family filtered into St Paul's Cathedral ahead of the Service of Thanksgiving.
Prince Charles and his wife the Duchess of Cornwall were the last to arrive at the Cathedral.
The Duke and Duchess of Cambridge arrived at St Paul’s to loud cheers. They waved to the public as they walked up the steps to the cathedral.
The Duchess wore a dress by Emilia Wickstead and hat by designer Philip Treacy.
The Duchess of Cornwall wore an ivory and gold embroidered coat dress by Fiona Clare and hat by Philip Treacy.
Prince Harry and Meghan were spotted ascending the stairs of the Cathedral, holding hands and smiling and waving to cheering crowds.
Prince Harry and Meghan ascend the steps of St Paul's holding hands TOBY MELVILLE
The Duchess of Sussex smiles to cheering crowds Aaron Chown
The Duke and Duchess of Cambridge have arrived at St Paul's TOBY MELVILLE
Princess Eugenie and husband Jack Brooksbank laugh with the Duke of Sussex prior to the National Service of Thanksgiving at St Paul's Cathedral Aaron Chown
The Queen's daughter Princess Anne took her seat in the Cathedral for the service Phil Noble
The Princess Royal, the Duchess of Cambridge and the Duke of Cambridge chat before the celebrations begin Aaron Chown
Members of the Royal Family sung in unison at the service Aaron Chown
Prime Minister Boris Johnson gives a reading to the congregation PHIL NOBLE
The Duke and Duchess walk down the aisle of St Paul's Dan Kitwood
The couple arrived after the Earl and Countess of Wessex, and their two children, and Princesses Beatrice and Eugenie along with their husbands.
They spent a few minutes talking to the senior cleric before they entered the place of worship and proceeded to greet the long line of clergy who are taking part in today’s service of Thanksgiving.
Harry stopped to chat for a few moments with the Archbishop of York who later will give the sermon and is expected to praise the Queen’s 70-year reign.
Senior members of the Royal Family are now present inside the Cathedral including Princess Anne, Vice Admiral Sir Tim Laurence, Prince Edward, Sophie the Countess of Wessex, Lady Louise Windsor and James, Viscount Severn.
Britain's Princess Micheal of Kent and her husband Prince Michael of Kent are also in attendance.
Zara Phillips and her husband Mike Tindall ascended the stairs of the Cathedral and have taken their seats among the congregation.
The service is set to begin at St Paul's at 11.30am, with members of the Royal Family, politicians and diplomats present within the cathedral.
The Duke and Duchess of Sussex are seated in the second row of the congregation for the Service of Thanksgiving, alongside Princesses Beatrice and Eugenie and their husbands, and Lady Sarah Chatto, the daughter of Princess Margaret, and her family.
Zara Tindall and her husband Mike Tindall arrive for the National Service of Thanksgiving TOBY MELVILLE
Harry and Meghan are seated behind the Earl and Countess of Wessex who are in the front row with their children, Lady Louise Mountbatten-Windsor and Viscount Severn, and the Duke and Duchess of Gloucester.
The Royal convoy arrives at the Cathedral GB NEWS
Across the aisle, the Prince of Wales and Duchess of Cornwall, who have ornate chairs, have seats alongside them for the Duke and Duchess of Cambridge and the Princess Royal and her husband, Vice Admiral Tim Laurence.
The Queen has pulled out of the thanksgiving service, after experiencing "discomfort" at the parade at Buckingham Palace.
The decision was made with "great reluctance" after pondering on the "journey and activity required", the Palace reported.
The four days of celebrations are marking the Queen's 70-year reign.
The 96-year-old monarch appeared twice yesterday at Buckingham Palace balcony, flanked by other senior royals, as they watched a military parade and waved at thousands of well-wishers gathered on The Mall.
She is expected to be resting and recuperating following yesterdays festivities.
The Archbishop of York Stephen Cottrell will deliver the sermon, following the news of the Archbishop of Canterbury Justin Welby testing positive for Covid-19.
Over 400 members of the public, including key workers, charity volunteers and members of the armed forces will be attending the service in recognition of their contribution to public life.