The Spice Girls' London concert has sold out in just 38 seconds.
More than one million fans registered for tickets for the 15 December show at the O2 Arena and those randomly selected in a ballot quickly bombarded the phone lines to secure their seats.
Chris Edmonds, boss of the show's promoters Ticketmaster, said: "It was a dramatic moment - the sales went live and there was a huge surge as fans
bombarded the lines."
Two more London dates - 16 and 18 December - have now been added to cope with the huge demand, with a fourth concert proposed for 2 January 2008.
The London concerts - which will take place at the O2 arena - are part of the band's hotly-anticipated world tour, which starts in Vancouver on 2 December.
The reformed girl group - Victoria Beckham, Mel B, Emma Bunton, Mel C and Geri Halliwell - will also perform in Los Angeles, New York, Sydney, Cape Town and Hong Kong.
The concerts will be the first time the girls have performed as a five-piece since May 1998, after Geri sensationally quit.
They announced they were reforming in June and will release their greatest hits album next month.