The Greatest Sia feat. Kendrick Lamar
17 year-old Maria Carroll from Theydon Bois was looking forward to the Jingle Bell Ball, some of her favourite artists were playing including Enrique Iglesias, but she had no idea exactly what she was in for when she turned up on Wednesday night
Enrique wanted someone on stage her could sing Hero to, and it looks like Maria made just enough noise to get noticed.
We were worried we might have lost Maria in the crowds at the O2, but someone managed to get her phone number after she came off stage.
Margherita was eager to get Maria's side of the story so gave her call first thing to find out what it's like to be serenaded to Hero by Enrique in front of 15,000 people at the O2.
Hear what Maria thought of her time on-stage at the Jingle Bell Ball by clicking the link on the right...