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The cuteness threatens to reach sloshing level as more Prince George pictures appeared Monday.

Saturday's picture was just George by himself, toddling down a lane at the Sensational Butterflies exhibit London's Natural History Museum.

Monday's pictures show him with his parents, Prince William and Duchess Kate, as they watch fluttering butterflies and George even gets within grasping distance of one of them.

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The pictures were taken on July 2 at the museum, where Kate is the royal patron, to mark George's first birthday Tuesday.

Will and Kate also Monday thanked well-wishers on George's behalf for the birthday congratulations pouring in from around the world.

George's Petit Bateau overalls, by the way, are already sold out at about $50.

PHOTOS: Prince George's first 11 months

Kate, meanwhile, is wearing her Suzannah silk tea dress in green and white, according to the HRHDuchessKate blog. She wore this pretty day dress during her Down Under tour in April but most recently under a green Erden coat for the Tour de France sendoff earlier this month.

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