How to tell if a celebritys Instagram is real?

[Mason Coletta]

There a celebrity who has 2 account one I know is real, the other one only has 500 followers but its private. On her private page it had the link to her public page. But on her public page she doesn't have a link to her private page. The only reason I even question if its real is because maybe she doesn't have the link I'm her public account because she doesn't want tons of follow requests. She said she only follows certain people but how can I test it to see if its real?