Royal wedding: Reaction in quotes
The announcement of Prince William's engagement to his long-time girlfriend Kate Middleton has prompted many congratulations. Here is a selection:
Prince William's grandmother said she was "absolutely delighted" for the couple.
Prince of Wales and Duchess of Cornwall
Prince William's father told the BBC he was "thrilled, obviously" about the engagement. "They've been practising long enough," he said.
The Duchess of Cornwall said: "It's the most brilliant news. I'm just so happy and so are they."
She added "it's wicked", as she left a theatre where the musical Wicked is playing.
Michael and Carole Middleton
"As you know Catherine and Prince William have been going out together for quite a number of years, which has been great for us because we have got to know William very well.
"We all think he is wonderful and we are extremely fond of him. They make a lovely couple, they are great fun to be with, and we've had a lot of laughs together.
"We wish them every happiness for the future."
Countess of Wessex
Prince William's aunt Sophie, wife of Prince Edward, said: "I think it's absolutely thrilling, couldn't be more excited."
Referring to family members, she said: "I think everybody's absolutely thrilled and we all wish them all the luck and love in the world."
Prime Minister David Cameron
The prime minister said: "A great day for our country, a great day for the Royal Family and obviously a great day for Prince William and for Kate."
"As well as this being a great moment for national celebration, I think we also have to remember that this is two young people who love each other who have made this announcement, who are looking forward to their wedding, and we must give them plenty of space to think about the future and what they are about to do."
The news was relayed to Mr Cameron during a cabinet meeting, and he announced it to his colleagues. He later spoke to the prince. "He was obviously extremely excited about the news and thrilled about what lies in store," he said.
Deputy Prime Minister Nick Clegg
"I am thrilled to hear the fantastic news of Prince William and Kate Middleton's engagement. Miriam [his wife] and I would like to send our very best wishes to the happy couple ahead of their big day."
Labour leader Ed Miliband
"I am delighted for Prince William and Kate Middleton and send my very best for their wedding. The whole country will be wishing them every happiness."
Church of England
The Archbishop of Canterbury, Rowan Williams, expressed his "delight" at news of the engagement, Lambeth Palace said.
First Minister of Wales Carwyn Jones
"Congratulations to Prince William and Kate Middleton on their engagement. I'm very pleased to hear that they plan to begin their married life in North Wales. I am sure that I speak for the people of Wales in wishing them the best for their future happiness."
Anglesey County Council
Selwyn Williams, chairman of the Isle of Anglesey County Council, said: "This is wonderful news and we are of course delighted that they have decided to live here in North Wales following their wedding.
"It's fantastic that they are enjoying the beauty, heritage and culture of Anglesey and that they want to be part of it. It's also very good news for the island in terms of raising our profile as a tourist destination."
Scotland's First Minister Alex Salmond
"My warmest congratulations to Prince William and Kate Middleton on their wonderful news. Of course this was a match made in St Andrews, and everyone in Scotland will join with me in wishing the prince and Ms Middleton every happiness as they look forward to their wedding day, and a long and fulfilling married life together."
University of St Andrews
Prince William met Miss Middleton when they were both studying at the University of St Andrews. A spokeswoman said: "We are absolutely delighted for William and Kate and their families. St Andrews is a special place - one in 10 of our students meet their future partner here, and our title as Britain's top matchmaking university signifies so much that is good about this community."
Mayor of London Boris Johnson
"I think it's fantastic. I'm very pleased for the pair of them and wish them every possible success and happiness. Everybody is pleased. In a weird way, it (a royal wedding) cheers everyone up."
House of Commons Speaker John Bercow
"I am sure members from all sides of the House will join me in congratulating the couple on this most happy occasion and wish them all the very best on their future together."
Bookmakers Ladbrokes, which has paid out to punters who bet on a November announcement, said: "We're delighted for the couple but we've shelled out a fortune. We've been caught with our pants down and there's not much we can do apart from grit our teeth and pay out."
Both Prince William and Miss Middleton performed voluntary work in Chile with the charity, but a year apart. Its chief executive Stacey Adams said: "The Raleigh International global community congratulates Prince William and Kate Middleton on their engagement. They both worked with young people from different backgrounds on community projects, developing an understanding and shared commitment to making a difference."