Markle and Prince Harry welcomed their first baby on Monday morning, and people from all over were excited to celebrate the arrival of the newest royal baby.

The couple announced that they had a baby boy via their official Instagram account on Monday, and people were gathered around Windsor Castle to celebrate the exciting news.

A unofficial town crier announced the birth with a scroll and ringing of a bell.

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Foto: An unofficial town crier was on hand to lead the celebration.sourceAlastair Grant/AP Images

Crowds lined the streets of Windsor with festive balloons and celebratory decorations.

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Foto: The crowd's decorations filled the streets.sourceAlastair Grant/AP Images

The excited public spread joy with "welcome baby" balloons and Union Jack flags.

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Foto: "Welcome baby."sourceAlastair Grant/AP Images

Members of the media also gathered on the castle's grounds to report the news. Harry confirmed in a short statement that he and Markle are planning on doing a photo call with the baby in two days' time on Wednesday.

Read more: Prince Harry gushes about the birth of his son: 'How any woman does what they do is beyond comprehension'

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Foto: Members of the press gathered on the castle's grounds.sourceAlastair Grant/AP Images

People swarmed the entrance of Buckingham Palace after the announcement of the birth.

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Foto: Buckingham Palace was also a place for celebration.sourceWill Martin/INSIDER

Some took selfies in front of the iconic palace to mark the momentous occasion.

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Foto: The news of the royal baby spread quickly.sourceWill Martin/INSIDER

London's BT Tower marked the occasion by displaying the words, "it's a baby boy," as seen here in a photo shared by Royal Central.

However, perhaps nobody was more excited about the royal baby's arrival than his father, Prince Harry, who couldn't stop smiling as he talked about his "very healthy boy."

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Foto: Prince Harry was "over the moon" to announce the birth of his first child.sourceSteve Parsons/PA Pool/AP Images