The Spice Girls singer will join comedian Howie Mandel and broadcaster Howard Stern at the judges' table for the eighth series of NBC's reality talent search.
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Mel B appears on 'The X Factor' in the UK
Mel B has previous judging experience on The X Factor Australia, and also appeared as a guest judge on The X Factor in the UK last summer.
She was previously a contestant on ABC's Dancing with the Stars.
"I've known Melanie since she did Dancing with the Stars... to know her is to know a very frank, strong, enduring entertainer. [She's] someone who has a very strong point of view," NBC president of alternative television Paul Telegdy told Entertainment Weekly.
"We needed somebody who was qualified for the job. She's an amazing singer, dancer and a huge personality. The contestants will get a lot of constructive feedback from her, and I can't wait to see her chemistry with Howard and Howie."
Mel B replaces the departing Sharon Osbourne, who has been linked with a return to The X Factor.
America's Got Talent is due to return to NBC on Tuesday, May 28.
Spice Girls musical 'Viva Forever!' - opening night photo gallery:
Mel B, Geri Halliwell, Emma Bunton and Mel C at the opening of the Spice Girls musical, Viva Forever!
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Copyright: PA Images Matt Crossick/Empics Entertainment
