Best-known for playing Eleven on hit Netflix series, there’s no doubt that Millie Bobby Brown is just the coolest.

As well as being a superb actress, she can also sing and last weekend she surprised attendees at Argentina Comic Con in Buenos Aires by treating them to a couple of songs.

She gave an impromptu performance of both ‘Ave Maria’, and Katy Perry’s ‘Firework’.

On her iconic character, Mille said: “She is powerful, iconic, a woman and a hero.

“I loved it (the look of Eleven) and knew right away that I would love the complete look to the character.”

Check out her singing here: