(hollyscoop.com) - Let the cat fight begin! Britney Spears is going head to head, again, with Victoria Beckham and the rest of the Spice Girls. The girls are battling it out to open the "Fashion Rocks" concert at London's Royal Albert Hall in October, one of the biggest events in the music and fashion industry. Britney's people claim that she's ready to 'prove' that she's back, while the Spice Girls' people are ready to get the ball rolling on their reunion tour. Organizers of the concert, which is being hosted by Samuel L. Jackson and Uma Thurman, originally wanted Britney to open the concert but her record label is worried her songs aren't "strong enough." They got a lot more than that to worry about. Homegirl has walked off every set she's worked on for the last 6 months to avoid another breakdown.