It’s snuggle time with grandpa!

Although royal fans went months without a glimpse ofPrince Louis, whowas bornApril 23, they were able to see howKate MiddletonandPrince William‘s third child is growing in family portraits celebratingPrince Charles‘ 70th birthday last week. Now, new snaps from the photo shoot show the adorable relationship between Charles and his youngest grandchild.

Chris Jackson/Getty Images for Clarence House

HRH The Prince of Wales at 70 in Pictures

HRH The Prince of Wales at 70 in Pictures

The photos, which were taken in September outside Clarence House, are thefirst images of Louissince hischristeningin July.

Photographer Jacksonposted the portrait of Louis and Prince Charles to Instagram, writing, “I’ve spent much of the last year documenting some intimate and ‘behind the scenes’ moments with The Prince of Wales to celebrate his 70th Birthday – It really has been an incredible priviledge to create such a unique set of images and a huge amount of fun at the same time.”

Chris Jackson/Getty

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A source tells PEOPLE thatPrince Williamand Princess Kate (in Alessandra Rich) were instrumental in ensuring the date and time for the photo shoot worked for everyone. They had arranged for a quick session, but the family hung around for longer than planned, catching up to swap stories of their summers.

“They pulled out all the stops to make sure everyone was around to be able to do it,” says the source.

Photographer Jackson said in a statement he was “delighted” to be asked to take the images: “It was particularly special to capture such an informal and relaxed family portrait over a fun afternoon in the gardens of Clarence House.”

Chris Jackson/Clarence House/Getty

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In a documentary marking Charles’s 70th birthday on Nov. 14, William says his father is “brilliant” withPrince George, 5,Princess Charlotte, 3, andPrince Louis. But William also says he wishes that his dad would slow down enough to be able to spare more time for them.

“It’s something I’m working more heavily on, put it that way,” William, 36, tellsPrince, Son and Heir:Charles at 70, whichaired on BBC One. “I think he does have time for it, but I would like him to have more time with the children.”

Now that his father has reached his landmark year, “it’s a perfect time to consolidate a little bit,” William says, “as most families would do, you are worried about having them around and making sure their health’s okay. He’s the fittest man I know, but equally I want him to be fit until he’s 95. Having more time with him at home would be lovely, and being able to you know play around with the grandchildren. Because when he’s there, he’s brilliant. But we need him there as much as possible.”

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Charles’s wife, Camilla, tells the program that he is great with her grandchildren. “He will get down on his knees and crawl about with them for hours, you know making funny noises and laughing and my grandchildren adore him, absolutely adore him,” she says. “He readsHarry Potterand he can do all the different voices and I think children really appreciate that.”

Chris Jackson/Getty Imagesfor Clarence House

HRH The Prince of Wales at 70 in Pictures

Queen Elizabethmade asweet speechpraising her eldest child and heir to the throne at a Buckingham Palace birthday bash on Wednesday, praising Charles’ dedication to saving the environment and raising a family.

“So this toast is to wish a happy birthday to my son, in every respect a duchy original,”Queen Elizabethconcluded, jokingly referring to thecompany which her son set up in 1990 to sell organic food products. “To you Charles. To the Prince of Wales.”

source: people.com