Singer Pixie Lott has been tipped to act as a guest judge on 'The X Factor' next week.

According to The Sun, the 19-year-old singer will join the panel for the Birmingham auditions next Monday.

A source said: "Pixie may be young but she's not afraid to speak her mind. She's only been in the charts for just over a year but she already sounds like a pro."

"And unlike a lot of pop acts these days, she's happy singing live so is well qualified to judge the wannabes."

This week Spice Girl Geri Halliwell joined the panel in place of absent judge Dannii Minogue, who is currently on maternity leave.