Prince Harry looked painfully awkward as he arrived at Westminster Abbey alongside Princess Beatrice and Princess Eugenie.
Harry joined his cousins and their husbands Edoardo Mapelli Mozzi and James Brooksbank as they entered the church.
He walked down the aisle by himself to take his seat in the third row ahead of the arrival of Charles and Camilla.
The Duke of Sussex flew from the US to London on Friday ahead of the Coronation.
Prince Harry looked painfully awkward as he arrived at Westminster Abbey alongside Princess Beatrice and Princess Eugenie.
PA
He has been invited to the Buckingham Palace lunch following the ceremony.
It is unclear whether he will accept his father's invitation.
The Duke of Sussex is expected to rush back to California following the ceremony to celebrate Prince Archie's fourth birthday in Montecito.
Meghan Markle and Prince Harry's son turns four today.
The Duke of Sussex flew from the US to London on Friday ahead of the Coronation.
PA
It was announced in April that Prince Harry would attend the Coronation on his own.
PA
The Duchess of Sussex has remained in the US with Archie and Lilibet.
It was announced in April that Prince Harry would attend the Coronation on his own.
The Palace said in a statement: "Buckingham Palace is pleased to confirm that the Duke of Sussex will attend the Coronation Service at Westminster Abbey on 6th May.
"The Duchess of Sussex will remain in California with Prince Archie and Princess Lilibet."