1) Palin, She lives close to Russia and has a great insight on the international sceen. She was also blessed by the "Witchcraft" Pastor, so my money is on her to know a thing or two about aliens. At the least she can show them how to hunt from the plane :-D
2) Paris Hilton so she can show them a good time. (D) (B) ($)Heck maybe she'll find her next BFF or a pet.
3) Bush, so they can take him with them as a souvineer. (G)