Rt Rev Justin Welby is now installed as the Archbishop of Canterbury.
The Most Rev Justin Welby has arrived at Canterbury Cathedral for his enthronement.
Prime Minister David Cameron, the Prince of Wales and the Duchess of Cornwall are among those watching as the Most Rev Welby becomes the Archbishop of Canterbury.
The Archbishop of York has offered a prayer for the Most Rev Justin Welby before his enthronement today.
Dr John Sentamu said: "As we welcome the inauguration of our brother Justin as Archbishop of Canterbury, let us all join together in saying this prayer today:
"May God, who anointed the Christ with the Holy Spirit at His baptism, anoint and empower Archbishop Justin to bring good news to the poor, to proclaim release to the captives, to set free those who are oppressed and to proclaim the acceptable year of the Lord.
"May the Lord keep him in the joy, simplicity and compassion of His Holy Gospel."
The Most Rev Justin Welby said he believes a woman will one day be made archbishop and added that some gay couples have loving relationships of "stunning quality", ahead of today's enthronement.
Pressed on the timing, he said: "Oh, I have no idea...when the right person turns up. But, yes, I think there certainly will."
In a separate interview with BBC News, the Most Rev Welby backed traditional Church teaching on homosexuality but said: "You see gay relationships that are just stunning in the quality of the relationship."
The Most Rev Justin Welby has given his "profound thanks" to everyone preparing for his enthronement as the Archbishop of Canterbury.
The former Bishop of Durham, The Most Reverend Justin Welby, will be enthroned as the 105th Archbishop of Canterbury later today.
He will be succeeding Dr Rowan Williams who is retiring at the end of December after ten years in the role as Archbishop.
Around 2000 guests are expected to attend the service, which is being held at Canterbury Cathedral this afternoon, including Prince Charles and the Prime Minister.
The Most Reverend Justin Welby will then become the head of the Church of England and spiritual leader of a 77 million-strong Anglican communion.
He has spoken to ITV News Social Affairs Editor Penny Marshall about his fears for the day and said he would mainly be wondering, "where am I meant to go next, and I hope I don't go the wrong way" during the elaborate ceremony:
He told to ITV News Social Affairs Editor Penny Marshall that the UK should encourage companies like, "some of the great companies of the past like Cadbury's, who have a deep sense of social utility and social value," to help those on the lowest wages.