Mario Testino

To go glamorous or relaxed in the world's most-anticipated engagement photos? For Prince William and Kate Middleton, the answer was clear: both!

The newly released photos – the official portrait photographs for the engagement of Prince William and Miss Catherine Middleton – were captured during a two-hour shoot by fashion photographer Mario Testino, who was hand-selected by the groom-to-be, 28, for the task.

"Prince William has worked with Mario Testino on many occasions before, and so the couple decided that he was the right choice for such an important portrait," said a Clarence House spokeswoman.

Middleton, 28, did her own makeup for the photos (as she did for her televised post-engagement interview), a source tells WHO, though Testino's makeup artist was on hand for touch-ups.

And those famous tresses? The princess-to-be got her hair done by her usual stylist, James Pryce, from the Richard Ward salon.

Mario Testino

For the formal photo – which was snapped in the historic Council Chamber linked to Clarence House, the official residence of William's father Prince Charles – Prince William donned a Turnbull and Asser suit, while Kate chose a white Reiss dress and Links earrings. For the dressed-down denim look – taken in the Cornwall Room of St. James's Palace – William changed into a Turnbull and Asser shirt and Brunello Cucinelli sweater, with Kate opting for a Whistles blouse.

Testino is famous for his photos of celebrities and royalty, among them Prince William, Prince Harry and their late mother, Princess Diana.

"I am very happy to have been asked to cover this historic moment that the whole world was waiting for," Testino said in a statement. "They are in their prime and brimming with happiness. I have never felt so much joy as when I see them together."