and Kate Middleton
have fallen in love all over again -- with an adorable cocker spaniel puppy, a boy, about a month old.
As confirmed earlier on Tuesday, the Duke and Duchess of Cambridge have adopted the puppy with whom they were photographed on a beach in Wales in early January.
"The puppy is theirs," a Palace aide tells Us Weekly, adding that Kate, 30, and Wiliam, 29, met the canine at Christmastime in Bucklebury, where Middleton grew up and where parents Michael and Carole still live.
"He belongs to a litter of cocker spaniels from one of Carole Middleton's friends near home," the aide explains, noting that William, 29, and Kate, 30, weren't 100 percent confident if they were ready for puppy parenthood.
"At first, they had just taken it home for a short period of time to see how they adapt," the aide says.
Didn't take long! "William and Catherine fell in love with the pup instantly and it wasn't long before they decided to keep him," the source says.
"He's now part of the royal fold!"