In an adorable Instagram tribute to the tot, whose parents are McBusted star Tom Fletcher and Marios's sister Giovanna Fletcher, TOWIE star Mario credited Buzz with helping him improve his life.
"There comes a turning point in life when you want to change your ways and better yourself and ways," he wrote. "This little man was that point! X".
Mario's words no doubt refer to his turbulent past which has included troubled relationships and allegations of drug use.
The image, which shows baby Buzz taking a nap on Mario's chest, followed numerous pictures of the duo spending time together.
"To infinity and beyond!" wrote Mario with a photo of himself holding Buzz in the air. "Having Buzz withdrawal symptoms!"
Earlier this year, when Buzz was just two months old, proud uncle Mario couldn't resist posting a picture of the pair enjoying a quiet bonding moment together.
"Nephew and uncle time :)," he wrote alongside the picture of Buzz looking intently up at Mario.