Prince George and Princess Charlotte's reaction to the birth of their 3rd sibling

The future rulers of England, Prince George, 4, and his sister Princess Charlotte, 2, visited their mother and newborn brother at St. Mary's Hospital.

The Duke and Duchess of Cambridge welcomed their third child on April 23, 2018, at 11:01 am. Hours later, the Duke left his wife's side to collect his children from Kensington Palace.

If a source close to the family can be believed, Prince George and Princess Charlotte "were very excited to meet" their brother, and couldn't wait for him to arrive home from the hospital.

As reported by Closer Weekly, the Royal siblings spent only 25 minutes with their mother before returning home with their nanny, Maria.

“It’s unlikely they’ll be asleep when William and Kate arrive home. They’ll be up all night, excited about their new brother.”

A source, US Magazine, April 23, 2018.

Prince William stayed behind at the hospital where he and Kate Middleton later introduced their son, and the fifth heir in line to the throne, to the crowd gathered outside.

According to US Magazine, the happy couple told reporters that they were 'very happy' and delighted. Later that day, the Royal family's official Twitter account shared a photo of the newborn with the caption: 'Welcome to the family.'

When asked about the baby's name, Prince William teased the crowd by telling them they would 'find out soon enough.' His name will be announced in the coming days.

Express reported that the name Arthur is the most 'likely moniker,' with odds stacked 2 to 1. Other possible names include Edward, Henry, James, and Frederick.

The Duke and Duchess make a point of choosing names with special meaning. Prince George is named after Queen Elizabeth's father, King George VI.

Princess Charlotte's name is a feminized version of her grandfather's name, Prince Charles. Her second name, Diana, is in tribute to her grandmother, the late Diana, Princess of Wales.