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Maybe out of fear!

Jennifer Aniston was prepared for a run-in with her ex-hubbie's ladylove at the Night Before pre-Oscar charity event this past Saturday. Aniston (via a confidant) tells Us Weekly that she thought it was "the perfect chance" encounter. Even Jolie recently told Vogue that she "would welcome it."

And then Angelina backed out hours before! What's up with that? Trying to get under Jennifer's skin?

Don't let it bother you, Jen - she's not worth your time!