PORTRAIT AT THE PALACE: Prince William and Kate Middleton have been keeping a decidedly low profile as a couple since they announced their engagement last month, but they made the front pages of British newspapers on Sunday with the release of their official engagement portraits. Shot by Mario Testino, who famously photographed Princess Diana for Vanity Fair shortly before her death and Prince Charles with his sons, the new snaps feature a close-up of the smiling couple, and a more formal, full-length shot. “I’m very happy that I’ve been asked to cover this historic moment, that the whole world was waiting for,” said Testino 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.” Both pictures were taken at St. James’s Palace, the official headquarters of the British monarchy, a short walk from Buckingham Palace. In one, Middleton dons a white dress with bracelet sleeves and a ruffle at the front from the fashion retail brand Reiss, and in the other she wears a white blouse from Whistles, another British fashion retail label. Prince William is wearing a blue suit and matching tie from British brand Turnbull & Asser in one, and a camel V-neck sweater from Italian brand Brunello Cucinelli and a Turnbull & Asser white shirt in the other, according to a Clarence House spokeswoman.