Britney Spears' U.K. tour organizers were forced to slash the price of her tickets to just $3 after the singer failed to sell out London's O2 Arena.

Last week promoters scrambled to shift unsold $150 tickets for Spears' weekend Circus gigs to ensure there were no empty seats in the British capital's massive venue. And at the last minute they were left with no choice but to let the tickets go with a bargain price tag of just $3.

An industry source tells British newspaper The Sun, "The shows on the weekend still had a number of unsold tickets by the end of last week. Organizers were mystified as to why, but really did not want a bare arena floor."

"It could send out a message that the star's run in London hasn't been a complete success. So on Thursday they contacted a website who specialize in getting rid of last-minute tickets. They all went, but taking a £98 hit on each sale wasn't particularly pleasing for anyone concerned."

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(This news article provided by World Entertainment News Network)