Prince William and Kate Middleton have been pronounced man and wife at Westminster Abbey.
They spent a private moment together with their families, as they signed the marriage register.
Some 1,900 guests watched the couple exchange their vows, with many millions watching at home. The service is expected to finish at 1215 BST.
Thousands of people are lining the procession route the couple will take to Buckingham Palace after the wedding.
The service has run smoothly so far but there was a tiny moment of drama as the prince struggled to place the wedding ring on Miss Middleton's finger.
Following a long tradition, the ring has been fashioned from Welsh gold given to Prince William by the Queen.
After the couple said their vows, in which she did not promise to obey William, the Archbishop of Canterbury, the Most Reverend Rowan Williams, declared: "I pronounce that they be man and wife together, in the name of the Father, and of the Son, and of the Holy Ghost. Amen."