Windsor, England ? Britain’s most famous gay couple – Sir Elton John and Canadian filmmaker David Furnish – tied the knot Wednesday in a much-anticipated ceremony that capped the first week of legalized civil unions in the United Kingdom.

John, 58, and Furnish, 43, were among hundreds of same-sex couples taking advantage of a new British law offering same-sex couples a legal status similar to marriage. The law took effect Wednesday in England and Wales. Ceremonies were held earlier this week in Northern Ireland and Scotland.

Fans turned up before sunrise in the cobbled streets around Windsor’s town hall, the Guildhall, where Prince Charles and Camilla Parker Bowles wed in April. Cameras flickered as the couple – John wearing purple spectacles and a black suit – walked out arm-in-arm, waving to the crowd.

The couple drove off in a black Rolls-Royce for a lunch followed by a glitzy reception with more than 700 guests.

Prime Minister Tony Blair, speaking to reporters at a news conference, wished the couple well and congratulated them for exercising their newfound legal right. Activists saw the union as milestone in the gay-rights movement.

Peter Tatchell, spokesman for the gay and lesbian human rights group OutRage! said the wedding “would raise the profile of gay love and commitment.”

Rock star Elton John, right, and his longtime partner David Furnish wave to members of the public after their civil partnership ceremony at the Guildhall, Windsor, England. John and Furnish were the most prominent of hundreds of same-sex couples that formed civil partnerships in England and Wales on Wednesday, the first day that such ceremonies become possible.

“Their same-sex civil partnership ceremony will be reported all over the world including in countries where news about gay issues is normally never reported,” he said. “This will give hope to millions of isolated, vulnerable, lesbian and gay people especially those living in repressive and homophobic countries.”

The new law – passed last year despite some opposition from Parliament’s unelected House of Lords – allows civil ceremonies that will give same-sex couples the same social security, tax, pension and inheritance rights as married couples.

Furnish, best known for a documentary about the pop star called “Tantrums and Tiaras,” has been with John for 12 years. Both acknowledged that their ceremony might have broader ramifications.

“As far as I’m concerned I’ve always considered myself committed to Elton and he’s the person that I want to spend the rest of my life with. So in that sense I don’t feel like the dynamic of our relationship is going to change,” Furnish told Attitude magazine. “But from a social standpoint, I think it’s hugely significant. It is a major, major change. It is one of the defining issues of our times.”

After the ceremony the couple headed for a lunch with their family to be followed by a reception – costing an estimated $1.75 million – where pink champagne and lamb would be served to hundreds of celebrity guests inside two giant white tents that have been erected on the grounds of the pop star’s Windsor mansion.

Their low-key ceremony was attended by friends and family, including John’s mother, Sheila, and stepfather, Fred, and Furnish’s parents, Gladys and Jack, who flew in from Canada.

Art dealer Jay Jopling was among the couple’s friends who said the ceremony was “like any other couple getting married.”

“They kissed at the end. It was very, very happy,” Jopling said.

John, who was married once before to studio engineer Renate Blauel, is known for such songs as “Crocodile Rock” and “Rocket Man.” He was also a close friend of Princess Diana, who died in a car crash in Paris in 1997, and was knighted in 1998 – an honor he described as the pinnacle of his decades-long career.

The Netherlands, Canada, Belgium and Spain have legalized same-sex marriage, while Germany, France and Switzerland have laws similar to Britain’s. In the United States, only Massachusetts allows gay marriage, while Vermont and Connecticut permit civil unions.