Since little Buzz's arrival a year ago, Mario has played the doting uncle to his sister Giovanna and McFly star Tom Fletcher's baby boy.
So it's no surprise that as Buzz marked his first birthday today, Mario was on hand to help his nephew celebrate.
Taking to Instagram, the Essex boy wished Buzz a happy birthday, telling the tot he "loved him very much" while sharing an ADORABLE photo.
In the snap, Buzz is pictured open-mouthed while rocking a very cool mohawk and red and white striped tee. Isn't he a cutie?!
Alongside his photo, Mario said: "A very happy 1st birthday to my gorgeous little nephew Buzz! Can't believe how quick this year has passed... Love you very much little man x."
Mario's photo of Buzz comes after he found himself at the centre of the latest TOWIE drama.
During Wednesday's night episode, viewers saw Ferne McCann plan to set up newcomer Chloe Lewis with Mario - despite him having a girlfriend.
After Ferne suggested Mario's romance could be on the rocks and that he had taken a liking to Chloe, his girlfriend Emma McVey hit back at the reality star, denying any romance troubles.
Tweeting Ferne directly, she said: "No my relationship was not on the rocks, Thanks Ferne. Really nice girl you are."
Ferne then replied suggesting Emma speaks to Mario "before blaming her".
So far Mario is yet to comment.
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