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As the countdown to Sunday's VMAs intensifies, it looks like old frenemies Britney and Christina are gearing up for another of many friendly showdowns in their long careers.

    1993 - 1995: Britney and Christina star together on the Mickey Mouse Club.

    1999: Britney and Christina release their debut albums.

    2003: Britney and Christina share the stage at the VMAs for the first time together since the Mickey Mouse Club, and share a kiss with Madonna!

    Sept. 7th, 2008: Who will make the bigger VMA splash, three-time nominee Britney, who will open the VMAs (and maybe more!), or Xtina, who will be there on hand to promote her new album and song?