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Biggest Feuds of 2011

Christina Aguilera vs. Avril Lavigne

Christina Aguilera caused some bad blood between herself and Avril Lavgine after being a rudey-patootey during a backstage encounter.

"Boy George was super nice, unlike Christina Aguilera, who was really mean to me when I said hi to her," Lavigne told ITV2 following a run-in at the 2011 BRIT Awards. "I remember going over and introducing myself and saying, 'Hi, we kinda do the same thing,' but I just kind of got [a snicker]." —Jeff Royer

(Photos: Hannes Magerstaedt, Getty Images; Jason Merritt, Getty Images)

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