Teen singing sensation Lorde has surprised students from her old school with a visit to judge its annual talent quest.
The 17-year-old - real name Ella Yelich-O'Connor - performed in the same competition at Belmont Intermediate on Auckland's North Shore when she was 12.
Her Belmont Idol performance of Warwick Avenue by Duffy was later shown to Universal Music representatives and she was signed to the label.
The Takapuna teen arrived at her old school with her mum hours after she returned from New York at 8am.
Lorde was one of three judges, and was introduced last resulting in cheers and screams from 550 students in the school hall.