Tom Cruise + Katie Holmes Wedding

Tom, 43, wants to have a ceremony at the Church of Scientology Celebrity Center in Los Angeles. "He is a diehard Scientologist," says an insider. "I think he wants Katie to be part of his belief system."

But this is Katie's first trip to the altar and she wants to go south of the border. An insider tells Star that Katie has her heart set on the Maroma Resort and Spa on Mexico's Yucatan Peninsula, where she and Tom, along with his kids -- son Connor, 10, and daughter Isabella, 12 -spent five days in May. "They spent a romantic few days there," says the source, "and they both were impressed by the beauty of the place."

"Katie is a strong woman, and despite their differences, they have a strong love for one another," says the source.

"She and Tom are trying to reach a place that will make both of them happy."