James Middleton delighted his fans on Sunday, as he shared the most adorable photo with his followers on Instagram.Kate Middleton's younger brother took to the social media site, where he posed with his dog Mabel's eight golden retriever puppies.SEE: James Middleton's wife Alizee Thevenet returns to social media to share hilarious videoJames beamed in the photo as he crouched in a field, holding four puppies in his arms as another four puppies surrounded him.The mental health activist and animal lover sweetly captioned the image: "Eight reasons to smile," adding smiling, paw print and heart emojis. He finished by writing: "Hope you've had a lovely weekend."WATCH: James Middleton shares heartwarming video of puppiesHis followers were quick to share their excitement at the adorable snapshot.