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Christina Aguilera — Disneyland Tantrum … Calls Mickey an A**hole

EXCLUSIVE

Christina Aguilera is not in the Christmas spirit … she spent her birthday last week in “The Most pleased Place On Earth” … in a heated argument with Mickey Mouse … TMZ has learned.

Our theme park source tells us while ringing in her 34th b-day at Disney’s California Adventure, Christina and her crew tried to get a pic with Mickey, but he…