Prince William, Kate Middleton Engagement

Prince William, Kate Middleton Release Official Engagement Portraits
Us Magazine - December 12, 2010 12:07 AM PS

o celebs:
o Kate Middleton
o Mario
o Prince Charles
o Prince
o Prince William
o Princess Diana

Story photo: Prince William, Kate Middleton Release Official Engagement PortraitsUs Magazine

They're ready to wed!

Prince William and Kate Middleton released a set of official engagement portraits Saturday, shot by famed fashion photographer Mario Testino.

"I am very happy to have been asked to cover this historic moment that the whole world was waiting for. They are in their prime and brimming with happiness," says Testino, the same photographer who took iconic pictures of Princess Diana shortly before her 1997 death. "I have never felt so much joy as when I see them together."

PHOTOS: William and Kate's royal romance

In the couple's official portraits taken Nov. 25 in St. James's Palace, London, Kate -- who will now be known as Catherine -- puts her 18-carat sparkler on display. The platinum ring, which features an oval blue sapphire surrounded by 14 smaller white diamonds, is the same engagement ring that belonged to William's late mother.

PHOTOS: Stars' blingy engagement rings

Those close to Middleton say the bride-to-be has taken a special interest in her appearance since she began dating the heir to the British throne eight years ago.

"Kate is always perfectly manicured, and she will have blow-dries before she goes out," says Katie Nicholl, royal watcher and author of William and Harry: Behind the Palace Walls. She adds that Middleton and William likely got their teeth whitened in advance of their Nov. 16 engagement announcement.

PHOTOS: How Kate's style has evolved over the years

The pair's April 29, 2011 nuptials should be the biggest royal event since Prince Charles married Diana in 1981.

Prince William and his commoner girlfriend, both 28, made a secret pact to marry three years ago while on vacation in the Seychelles. "Kate wanted assurances from William," Nicholl explains. "William told Kate she was The One, but he was not ready to get married. She...agreed to wait for him."

Another insider tells Us: "He wants to spend the rest of his life with her."

For much more on the royal engagement -- potential party venues, how Prince William is "determined" not to isolate his bride, Queen Elizabeth's tutelage, and more -- pick up the latest Us Weekly, on stands today!