Annie Leibovitz Snaps 68 Years of Royal Wedded Bliss

Friday is Prince Philip's 95th birthday—a fitting day to see the release of the final Annie Leibovitz photo of his wife, Queen Elizabeth II, with him smiling sweetly by her side. The fourth photo of the queen in the Leibovitz four-photo series, commissioned to celebrate Elizabeth's 90th birthday in April, shows the royal couple depicted in what USA Today describes as the celebrity photographer's "widely acclaimed lush style combined with her empathetic insight." The portrait of the pastel-adorned pair, taken shortly after Easter at Windsor Castle, was released just as the UK's official celebration of Elizabeth's birthday kicks off. The other three photos, seen here, were unveiled in April.

The couple has been married for nearly 69 years—the most enduring marriage ever for a British monarch, per PBS. "It's the longest royal marriage in history," a writer for a recent documentary on the queen tells People. A tweet from the official Royal Family account on Thursday paid tribute to their long love affair, quoting the queen as saying: "He has, quite simply, been my strength & stay all these years." One more interesting factoid from PBS: Elizabeth remains the only Brit who wasn't single at his or her coronation ceremony. (Click to see iconic photos from that ceremony.)