Guide: Who is Mel B?
Pop star Mel B has revealed as the fourth judge on this year's X Factor.
The 39-year-old singer found fame in girl-power pop group The Spice Girls.
The group topped the chart with Wannabe in 1996, and became a global phenomenon.
The Spice Girls had nine number one singles and sold 80 million records.
Mel is no stranger to The X Factor. She was a judge on the Australian version of the show for two years.
She has also been a judge on America's Got Talent, and appeared as a guest judge on the UK version of The X Factor in 2012.
Mel B said: "I can't wait to get started and find some amazing talent."