The former Spice Girl met with Simon Cowell two weeks ago about the job and joins with him, Louis Walsh, and returning judge Cheryl Cole who is back with a £1.5m ($2.67m) pay packet.
Mel B has two seasons of judging X Factor Australia and will appear on Nine’s upcoming series of The Voice Kids and America’s Got Talent. But she had a falling out with Seven after signing with Nine for Australia’s Got Talent, before being replaced by Geri Halliwell.
A show source told the Mirror: “Mel B was Simon’s number one choice for the final place on the panel, he was really impressed when they met up and he likes her style and what she was saying she can bring to the show in their meeting.
“She is certainly not a shrinking violet and will say exactly what she thinks. She will stir things and be up for a laugh which is important.”