By Kara O'Neill for Mirror UK
When you get picked to a bridesmaid, you have to take your duties seriously, no matter how old (or young!) you are.
So when JoJo Lomelino was chosen as a flowergirl at a recent wedding, she was intent on making sure that no one would be ruining her big moment - even her own father.
In the clip, JoJo tells her dad that he isn't allowed to talk to her as she's walking down the aisle.
She says: "You don't know what weddings look like.
"You can't talk to people, OK? You can't call my name while I'm going to be walking down the aisle. No one can call us 'cause we're gonna be busy."
But when her dad asks if he can shout 'Princess' at her instead of her name, JoJo is clearly exasperated.
She adds: "No, dad! There's going to be a bunch of people sitting and they're going to hear us.
"And they're going to be like: 'What are you doing? That is a dumb person'.
"And they're not going to think you're a good daddy."
She ends her speech by holding her hands in the air and tells her dad: "You do not understand weddings. At all."
Alongside the video on YouTube, the comment reads: "Don't mess with JoJo when she's being a flowergirl.
"In this video, she takes all the precautionary measures to make sure dad doesn't embarrass her by calling her name as she's doing her flowergirl duties.
"This is serious 4-year-old business, people."
The adorable clip has now clocked up 565,326 views since it was shared on YouTube on September 14.