Pop star Melanie Chisholm has threatened to quit the Spice Girls - if her bandmates behave outrageously on their forthcoming world tour.

The singer - who has previously dubbed herself 'Reluctant Spice' because she was the last to agree to a reunion - is keen to avoid the tantrums and tour demands the girls are already rumored to be making.

And the 33-year-old isn't afraid to quit the Wannabe group if the girls' behavior gets out of hand.

She says, "If it goes into a diva drama, I'm out of the circus." The reformed group will kick off their world tour on December 2 in Vancouver, Canada.

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(This news article provided by World Entertainment News Network)