Former Spice Girl singer Mel B will reportedly be unveiled today as the fourth X Factor judge in the next series of the singing contest.

She is said to have signed a £1 million deal to take the last spot in the new judging panel, alongside Simon Cowell, Louis Walsh and Cheryl Cole.

Mel B, 39, has previously appeared as a guest judge on the panel, as well as on both the American and Australian versions of the show.

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The deal was agreed in Sydney, where the singer is currently a judge on talent show The Voice Kids.

Her £1 million fee includes a £100,000 wardrobe and expenses allowance.

Cheryl Cole, 30, and show boss Simon Cowell, 54, revealed in March that they would revive their on-screen partnership for the ITV talent show after a four-year break.

Cole said at the time that she was hoping for a "strong woman" to be added the to panel of four.

The first X Factor auditions will start in Manchester on Monday, reportedly a day later than planned to accommodate Mel B.