Prince George, whose ninth birthday photo was released last week, looks more like his father Prince William than ever before. Princess Charlotte is also her father's doppelganger, so much so that the Duke and Duchess of Cambridge themselves once mistook a childhood photo of Prince William for one of Princess Charlotte.

"Is that me?" William said in 2020, pointing to a photo of himself as a child. 'You look exactly like Charlotte. I can't believe it." Kate agreed, "You look just like Charlotte." (The Windsor gene runs strong in both children.)

That leaves Prince Louis - the Cambridge child whose mother, Kate Middleton, says he looks just like her.

"Everyone always comments that Louis looks just like Kate," a friend told PEOPLE." She loves it and thinks it's so wonderful." She often says he is the only one of her children who actually looks like her!"

she jokes.

Last month, during a visit to the Little Village location in the Brent neighborhood, part of London's largest baby bank network, Kate was apparently smitten by a baby resting in a stroller. She had previously hinted that with three children, the Cambridge family is perfect, but on several occasions recently, either Kate or William had joked about her awkwardness after meeting the young children Kate visited the University of Copenhagen on the first day of her solo tour of Denmark in February, met with the parents and the baby and said, "William always worries that I'm going to meet a baby under a year old. I would come home and say, 'Let's have another baby.'" Later in May, William and Kate visited a class in Scotland, where students learned about empathy by observing infants." Can you get my wife out of here before she turns into a broody?" William joked. William joked.

On a visit to Little Village, Kate remarked about their twins, Louis, "They're growing up so fast," PEOPLE reported.

"I keep thinking Louis is my baby," she said. But he's a proper boy now."