• James Middleton welcomes first child
  • He's Princess Kate's younger brother
  • Middleton is married to French financial analyst Alizee Thevenet

The brother of the Princess of Wales, James Middleton, and Alizee Thevenet, are now officially parents!

Middleton and Thevenet welcome their first child

The entrepreneur behind 'Ella & Co.' and a staunch advocate for mental health has joyfully welcomed their first child with Alizee. Recently, candid photos of the couple were published in 'The Daily Mail' as they strolled through London's Notting Hill neighborhood with a stroller.

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While the couple themselves have not confirmed the news, details about the baby's name and gender remain a mystery for now.

In July, James announced Alizee's pregnancy on Instagram, posting a picture of his wife in a lovely olive green dress, accompanied by their dog Mable, in a picturesque countryside setting.

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Mandatory Credit: Photo by Javier Garcia/Shutterstock (13995919cb) James Middleton and Alizee Thevenet Wimbledon Tennis

James expressed his excitement, saying, "We couldn't be more excited … well Mable might be." He also reflected on the challenges he faced earlier in the year with the loss of his cherished dog, Ella, stating, "It was a very difficult start to the year after losing my beloved Ella however we will end the year with the most precious little addition to our growing family."

Growing the royal family

This new addition marks James and Alizee's first foray into parenthood, adding another layer to Kate Middleton's role as an aunt. James is the youngest child and the sole son of Carole and Michael Middleton, who have had ample experience as devoted grandparents. In addition to Princess Kate and Prince William's trio of children—Prince George (10), Princess Charlotte (8), and Prince Louis (5)—Carole and Mike also have three young grandchildren courtesy of their daughter Pippa and her husband James Matthews: Arthur, Grace, and Rose.

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This new arrival expands Princess Kate's aunt status to six times over, including her nieces and nephews, such as her sister Pippa and James Matthews' three children—Arthur, Grace, and Rose—and Meghan Markle and Prince Harry's two little ones—Prince Archie and Princess Lilibet.

James and Alizee's baby also becomes a new cousin for Prince George, Princess Charlotte, and Prince Louis.