TV
Ken McKay / Rex Features
The Irish singer fell victim to an unknown illness shortly before setting off for a rehearsal for the ITV1 ice-skating contest.
She is believed to have been placed on a drip after appearing to be suffering severe flu symptoms and dehydration.
Her spokesperson said: "She is very sick but we are crossing our fingers that everything is OK."
A source told the Mirror that Mumba is now resting and is determined to recover in time for the show's launch on Sunday.
Hollyoaks star Chris Fountain was injured in rehearsals for the series earlier this week.
Dancing On Ice starts on Sunday at 5.50pm on ITV1.
> Click here for the full 2008 lineup
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