The hip hop star reportedly got involved in a row with one of the hopefuls who were trying out for the new show at BBC 's Television Centre in London.
Jessie is said to have hit back at one mouthy wannabe: "Don't snap at me!" as she gave them feedback on their performance.
But Jessie then found herself in an argument with Welsh singer Tom Jones over the budding performer, who Jessie had told needed some work on her voice.
He quipped: "Your job is to coach!"
The Voice UK auditions will air on BBC One from March.