Tulisa Constostavlos returned to the X Factor stage this evening, as the final got underway.
Former Spice Girl Mel B was forced to withdraw with a mystery illness.
X Factor judge Mel B has been unwell for the past few days and missed rehearsals for the upcoming final on Thursday, the show has revealed.
The former Spice Girl will miss tonight's programme following doctor's advice.
The Mirror reported that she was kept in a private ward overnight after receiving treatment.
Tulisa Contostavlos will take the place of Mel B as a guest judge on tonight's X Factor final after the former Spice Girl was forced to withdraw with a mystery illness.
The former N-Dubz singer - a previous judge who also appeared as a guest mentor earlier in this series - will offer support to Andrea Faustini during the final.
X Factor judge Mel B has been forced to withdraw from tonight's final with illness, the show has announced.
There is only a 10% chance Mel B will be fit enough to attend the X Factor final after she was taken to hospital with a mystery illness, it was reported.
The Mirror said the sick Spice Girl was "seriously ill" and would be kept in for further tests.
A spokesman for Mel said: “We’re not making any comment. It’s a private medical matter.”
If she is still too ill Mel's act Andrea Faustini will be left without a mentor on tonight's show.
It is thought if Mel is unable to turn upCheryl Fernandez-Versini could step in to support him.
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