Geri Halliwell and the other Spice Girls end their tour in Toronto

"It probably won't ever happen again," she said. "This is the last time you will ever get to see this Girl Power, the five Spices on the stage as one."

The Return of the Spice Girls world tour opened in December and closes in Toronto, Canada on 26 February.

The group have already cut the tour short, cancelling four shows.

But Halliwell denied this was owing to in-fighting, saying: "Actually it's gone on longer than planned because we thought we were only going to go to the end of January.

"After February everybody had commitments; kids had to go back to school and that."

Halliwell went on: "What this reunion taught me is you can never say never.

"If you had asked me 10 years ago whether there'd ever be a Spice Girls reunion concert, I'd have gone, 'No way!'"