Kate Middleton Maternity Dress: Pregnant Duchess Dons Alexander McQueen By Sarah Burton Gown To Conceal Barely There Baby Bump [PHOTOS]

Kate Middleton may have just announced she and Prince William are pregnant with their first royal baby, but the Duchess is already donning maternity wear despite a barely-there baby bump.

During an appearance at the Sports Personality Year Awards on Monday, the Duchess of Cambridge, 30, wore what Grazia called a "maternity dress," a green Alexander McQueen by Sarah Burton gown which concealed her lower stomach.

The dress, designed by Burton who also created Middleton's wedding dress, was a floor length gown in crepe wool with bell sleeves, a deep v-neck, tromp l'oeil belted waistband with a slight peplum flare. The dress had a high slit, which Middleton kept at wraps paired with Black Jimmy Choo shoes, Kiki McDonough blue topaz earrings and an Asprey button pendant.

The dress is available in black on the Alexander McQueen website for £1000 or roughly $1,630.

Middleton wore the dress just days after designer Burton, who took over for McQueen after his suicide in 2010, told The Telegraph she hopes to design the Duchess' maternity wardrobe. Burton was also awarded with an OBE by Prince Charles at Buckingham Palace last Thursday.

"I'm very, very humbled and it's just a huge honor to be here -- I'm very lucky," Burton told The Telegraph. "I've been given some amazing opportunities -- to work for someone as amazing as Lee and then having the honor of doing the wedding dress, that was a real honor."

The designer, who is also pregnant but with twins, was asked if she will design Middleton's wardrobe during her pregnancy, to which she responded: "I hope I will be."

Grazia noted that it was announced Middleton would attend the Monday celebration after canceling her last four public appearances due to intense morning sickness. A royal source told Grazia Middleton was "keen to show her support to the UK’s sportsmen and women at this prestigious event which caps a momentous year for British sport."

Middleton presented awards to Bradley Wiggins for the Sports Personality of the Year and London 2012 chief Lord Coe, who won the Lifetime Achievement award.

Middleton first announced her pregnancy on Dec. 3 after being rushed to the hospital for severe morning sickness, known as Hypermesis Gravidarium.

"Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting a baby," a Palace rep said in a statement. "The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall and Prince Harry and members of both families are delighted with the news."

"The Duchess was admitted this afternoon to King Edward VII Hospital in Central London with Hyperemesis Gravidarum," the rep continued. "As the pregnancy is in its very early stages, Her Royal Highness is expected to stay in hospital for several days and will require a period of rest thereafter."

The Duchess was planning to announce she was pregnant once she was three months pregnant, but her condition and hospitalization forced her to announce sooner. Therefore, it is unclear how far along Middleton's pregnancy is or when the baby will be due. The Telegraph, though, predicted Middleton will have the baby sometime in May next year, around the same time as the couple's second wedding anniversary.