Former Beatle Paul McCartney married American heiress Nancy Shevell on Sunday, after receiving a blessing at a local London synagogue.

McCartney wed the divorced New Yorker in a civil ceremony at London's Marylebone Register Office before 30 invited guests, ahead of a reception in his back garden in north London, reports said. He reportedly serenaded her with a song written in her honor.

The 69-year-old singer-songwriter, whose success in writing some of the world's most enduring pop classics with the Beatles has helped him to amass a fortune of hundreds of millions of dollars, is marrying for the third time.

He and Shevell, 51, posted wedding banns last month in the same place where McCartney married his late first wife Linda in 1969, at the height of the Beatles' fame. Linda died of breast cancer in 1998. His second marriage, to former model Heather Mills, ended in acrimonious divorce in 2008.

A fridge filled with champagne was delivered on Saturday to the house in the upmarket neighborhood of St John's Wood - within a stone's throw of the Abbey Road studio where the Beatles recorded most of their albums.

McCartney's spokesman declined comment on Saturday, but McCartney himself briefly spoke to reporters outside his home, saying: "Hi guys, thanks for coming out. We're looking forward to it."

Asked if he was nervous about the big day, McCartney laughed and said: "Don't be silly, now. Of course not," according to the Sunday Mirror.

The choice of wedding date seemed especially poignant as Sunday would have been the 71st birthday of John Lennon, McCartney's songwriting partner, who was gunned down in New York in 1980.

As well as the new song, he reportedly sang "Let it Be", which he sang to Shevell on one of their first holidays together three years ago, and then her favorite, "Let Me Roll It", according to the Sunday Mirror.

According to media reports, there were no Jewish rituals performed during the ceremony, even though Shevell is Jewish. The couple did, however, attend Yom Kippur services together over the weekend at the Liberal Jewish Synagogue in St John's Wood, near McCartney’s home and close to Abbey Road studios where the Beatles recorded most of their songs.

McCartney's fashion-designer daughter Stella made Shevell's dress and helped create the three-course organic vegetarian menu, the paper reported.

McCartney has a son, two daughters and a stepdaughter from his marriage to Linda, and a daughter from his marriage to Mills.

All his children were at the wedding, and his brother was best man, the Mirror said, adding that the couple would honeymoon in the Caribbean.