Angelina Jolie spent last Thursday in Iraq dodging bullets in the Green Zone and pregnancy rumors on CNN, but that flak vest she's wearing in those pics won't offer much protection against the minefield of Jennifer Aniston at an Oscar party to be held on February 23.

Angie and baby-daddy Brad Pitt are on the host committee of The Night Before—a charity event held the evening prior to the Academy Awards—but Brad's ex-wife, Aniston, is also a hostesses with the mostest. If all parties show it cold be the climax to a colossal confrontation that began three years ago when Brad left Jen in 2005 claiming it had nothing to do with Mr. & Mrs. Smith co-star, spent the next several months denying he had any relationship with his Mr. & Mrs. Smith co-star, then proceeded to publicly, kiss, cuddle and raise half the world's children with his Mr. & Mrs. Smith co-star. The two women have yet to meet since—yummy!

One inside source/friend of a friend of someone's assistant tells Star that "Brad is prepared for a knockdown, drag-out fight, but he's hoping for the best!" Oh but how the weekly warriors are hoping for the death match—and lets be honest the rest of us would buy tickets to that, too!

In this corner, the undisputed Humanitarian Home-wrecker, champion of the world, Angelina Jolie weighing in at a walloping 123 pounds (hey she's preggers). Angie's preparation for the big fight includes strategy sessions and photo ops with top Commander General David Petraues and the troops (Life & Style), becoming sperminated with twins (all mags reporting), and gold-dipped sparing sessions with mythical warrior Beowulf. As a source tells Star, "She's not intimidated by Jen. If Jen is nice, Angie will be nice. If Jen is mean, Angie will let her have it."

The challenger, Jennifer Aniston (weighing it at somewhere around, a buck ten), has taken a slightly different tactic becoming the poster gal for sad singletons everywhere, turning 39 last week, tagging along on vacations with her friend Courtney Cox, and spending way too much time with dog Dolly, according to OK! The mag even drags out a "To Do list" Jen gave InStyle Magazine back in 2005—so far, they note, the only thing she's done is bought a house that she hasn't even moved in! Is this anyway to prepare for the title fight?

Luckily Us gets etiquette expert Sue Fox to weigh in. Fox says that when Jen sees Ange she should say, "It's good to see you," congratulate her on the pregnancy and then talk about the films, blah, blah, blah. But come on we want there to be hair pulling, perhaps Dynasty-style slapping, or perhaps wrestling in some sort of spilled foodstuff at the party. Or better yet Jen should just go up to Angie and give her a big open-mouthed kiss—even Brad might pay for front row seats to that!