Pregnant Kate Middleton Wears Elaborate Updo Hairstyle at One of Her Final Appearances Before Baby: Photos

Prince William and Kate Middleton
Kate Middleton (with Prince William) shows off her baby bump in a blue coat outside St. Paul's Cathedral in London on March 13. Chris Jackson/Getty Images

Only one more month to go!

As her April due date approaches, pregnant Kate Middleton joined the royal family at a service honoring the troops who fought in Afghanistan, held at St. Paul's Cathedral on Friday, March 13, in London. 

The Duchess of Cambridge, 33, now eight months along, donned a navy blue Beulah "Chiara" wool coat, teamed with a bow-topped hat and suede pumps, for the event. Adding even more sophistication to her style, Middleton opted for an intricate (and rare) updo—a twisted chignon, pinned at the nape. See Kate Middleton's growing baby bump pics.

Will and Kate closeup bump
Prince William and Kate Middleton, snapped cradling her baby bump, leave St Paul's Cathedral after a Service of Commemoration for troops who were stationed in Afghanistan on March 13, in London. Chris Jackson/Getty Images

Middleton was joined by her husband, Prince William, and his brother, Prince Harry, who both appeared dapper in their uniforms, embellished with military regalia. Queen Elizabeth (who led the service), Prince Philip, Prince Charles, and Camilla, Duchess of Cornwall were present, too.

The ceremony marked the end of the UK's 13-year combat operations in Afghanistan. It was attended not only by the royals, but also by the families of those lost in the war, as well as veterans.

Will and Kate full profile shot
Pregnant Kate Middleton (with Prince William) works her baby bump in a blue wool coat while at the service at St. Paul's Cathedral on March 13. Neil Mockford/Alex Huckle/GC Images

During the service the Reverend Dr. David Ison thanked the country's commitment to the troops, then prayed for the citizens of Afghanistan and offered this speech: "We remember those who have been injured in body, mind, and spirit and we pray for their continued well-being and for those who especially support them."

Will, kate, Harry singing
Prince Harry, Duchess Catherine, and Prince William sing along during the service inside St. Paul's Cathedral in London on March 13. JOHN STILLWELL/AFP/Getty Images

While the day was a somber one, the royal couple, who are due to welcome their child in just over a month, couldn't help but smile on the steps of the cathedral, as the Duchess' coat, bundled around her cradled baby bump, blew around her.

Harry and William salute
Salute! Prince William and Harry, with Kate Middleton between them, honor the troops in London on March 13. JUSTIN TALLIS/AFP/Getty Images

The appearance caps off a busy week for Middleton. The Duchess attended a London service in honor of Commonwealth Day on Monday, visited the Turner Art Gallery in Margate on Tuesday, and fan-girled on the London set of Downton Abbey on Thursday.

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!