Kensington Palace post a super cute throwback photo of Prince William and Prince Harry

Following today's announcement that Prince William would take on the role of Best Man at Prince Harry and Meghan Markle's wedding next month, Kensington Palace posted a super cute photo of the young Princes.

After confirming the Best Man news, the Palace tweeted the photo with the caption, 'The Duke of Cambridge is honoured to have been asked, and is very much looking forward to supporting his brother at St George's Chapel, Windsor on May 19th.'

The photo of young Prince William and Prince Harry received a number of comments with many of the fans saying how 'adorable' and 'cute' it was.

One fan said, 'Love to see the brothers together, they have such a strong bond and it will be an emotional day for William to see Harry take the step towards his other important life long partnership with Meghan. I wish them so much happiness, all of them.X'

Another fan commented, 'Own!! Three times cute! They've supported each other in difficult moments, so both deserve an important role in each other's happy moments too! ❤💙❤'.

Whilst many fans were excited by the photo and the news, a number of fans also seemed to be preoccupied with wanting to know the name of the Duke and Duchess of Cambridge's most recent arrival.

The couple announced the birth of their third child on Monday, which also happened to be St George's Day. Since Monday there has been a lot of discussion over what the new Prince's name could be, with many bookies slashing the odds on Alexander recently.

Fans on Twitter replied to the Palace's tweet wanting to know the baby's name!

The Duke and Duchess of Cambridge welcomed a baby boy into the world at 11.01am on Monday morning and hours later they took to the steps of the infamous Lindo Wing at St. Mary’s Hospital in London.

See all of the photos of the Duke and Duchess of Cambridge with their newborn baby below:

The news of the new Royal baby was announced beforehand via a statement on the official Kensington Palace Twitter account.

The statement read, 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 1101hrs. The baby weighs 8lbs 7oz. The Duke of Cambridge was present for the birth. Her Royal Highness and her child are both doing well'. sic

The Palace went on to reveal other members of the Royal family were 'delighted' with the news saying, 'The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news.'

The couple are now at home with their newborn son and their other children, four-year-old Prince George and two-year-old Princess Charlotte.