Kate Middleton, William and Harry Give Thanks to Queen Elizabeth on Final Day of Jubilee Celebrations

Royal family congregates at St. Paul's Cathedral for 75-minute service of thanksgiving in honor of monarch's 60 years on the throne

We're not sure about the waves, but when it comes to pomp and pageantry, Britannia has been ruling the global roost this week.

Alas, the seemingly never-ending Diamond Jubilee celebrations of Queen Elizabeth II do come to a formal end today, as Prince William, Kate Middleton and Prince Harry, along with the other senior royals, a capital city lined with revelers and a cathedral full of subjects (but not, sadly, an ailing Prince Philip) came together for a service of thanksgiving honoring the monarch's 60 years on the throne.

Perhaps only slightly, albeit not noticeably, worse for wear after yesterday's star-studded, into-the-night Jubilee concert in front of Buckingham Palace, the royal family was up bright and early this morning, attending the national service of thanksgiving held at St. Paul's Cathedral in honor of the queen.

Though the 86-year-old monarch processed alone as Philip recovers from his bladder infection, she was joined not only by Will, Kate and Harry but Prince Charles, Camilla, Princesses Eugenie and Beatrice, and other members of the family, as well as Prime Minister David Cameron. Upon her arrival to the grounds early Tuesday, crowds greeted the queen, rather appropriately, with shouts of "God save the queen!" as well as a trumpet fanfare.

The Archbishop of Canterbury Dr. Rowan Williams, who presided over the 75-minute mass, praised Elizabeth's lifetime of service.

"We are marking six decades of living proof that public service is possible and that it is a place where happiness can be found," he said. "I found in the queen someone who can be friendly, who can be informal, who can be extremely funny in private—and not everybody appreciates just how funny she can be—who is quite prepared to tease and to be teased, and who, while retaining her dignity always, doesn't stand on her dignity in a conversation."

Afterward the royals embarked on a carriage procession, with the queen heading to Mansion House and other senior royals, including a once-again Alexander McQueen-decked-out Kate, heading to Guildhall to host a lunch reception for nearly 700 of their closest friends.

The queen capped off the day's—and indeed week's—festivities at the end of the day, when she delivered a specially televised address to the nation.