The 15-year-old actress is a big fan of the former 'Harry Potter' star - who was just 11 years old when she starred as Hermione Grainger in the first movie of the wizarding franchise - and aspires to achieve the same career successes.
She said: ''I love Emma Watson, I think she's amazing. She would probably be who I would say I'd love a career like.
''She's a great actress and we've kind of seen her grow up too, so we've got that similar vibe going on.''
Kiernan began work on 'Mad Men' - which will end after the current series - when she was just eight years old and found her final days of filming just as exciting as her first.
She said: ''That first day on set was probably one of the best. I was so excited to be there, just this crazy excitement. And it was never lost, which is great.''
And despite her young years, the actress has a strong friendship with 37-year-old January Jones, who played her on-screen mother.
She told Stylist magazine: ''She's so fun, so sweet - we were always just really great pals.''
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