Both Dad, 35, andDuchess Kate, 36, listed their occupations as Prince and Princess of the United Kingdom.
Mountbatten, a great-grandson of Queen Victoria, was His Serene Highness Prince Louis of Battenberg until 1917, when the royal family anglicized its names to avoid anti-German feeling during World War I. He became Lord Louis Mountbatten.
Kensington Palace marked the occasion with an adorable throwback photo from the Duke and Duchess of Cambridge's wedding day in 2011.
"The baby will be known as His Royal Highness Prince Louis of Cambridge".
The 26-year-old pop star is delighted that the Duke and Duchess of Cambridge's third child shares a name with him and he's going to send the tot an Adidas tracksuit, his trademark sportswear, to welcome him to the world.
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"The baby weighs 8lbs 7oz".
Princess will only fall before her name if she was born into the Royal Family, such as Princess Charlotte or Princess Eugenie.
By the evening, the Duke and Duchess of Cambridge appeared on the steps of the Lindo Wing with their still unnamed son. The newlyweds now reside at Kensington Palace.
However, it is estimated that it will cost Kate and William £727,885 ($1 million) to raise Prince Louis to adulthood.
The birth means that the Duke of York is now seventh in line to the throne (he was second at the time of his birth) and could marry without the Queen's permission. The company is the proud father made the older children, four-year-old Prince George and two year old Princess Charlotte. "Now we know the young Prince's name, we look forward to welcoming any guests named Louis to the park to join us as we celebrate our royal neighbours' news". His middle name Charles, of course, comes from his paternal grandfather, The Prince of Wales.