A staff member at Universal Music in Auckland confirmed to the Herald the teenager had signed a deal with them but would not discuss details.
The label has cultivated an air of mystery about the teenager. Although having a large social media presence, she has uploaded very few photos of herself. Some of her songs, including The Love Club and Royals, have been removed from YouTube by Universal with a message saying the label "has blocked it in your country on copyright grounds".
However, her success is already attracting attention.
Fans on her Facebook site have asked her to put her songs on Finnish Spotify, and she has gained endorsements from critically acclaimed Canadian musician Grimes and blogger Perez Hilton.
Yesterday, Takapuna Grammar principal Simon Lamb said Yelich-O'Connor, now in Year 12, frequently performed at school.
"She has an amazing voice, a lovely voice. A wonderful performer. We are really proud of her achievements to date and really proud to support her in her pursuit of that career.
"She's a bright girl. She got an excellence endorsement out of NCEA last year, and she's going into the International Baccalaureate programme."
In a previous interview on katherineisawesome.com, Yelich-O'Connor said she was discovered after a videotape of her talent show performance at Belmont Intermediate found its way to Universal.
* Listen to Lorde here.