Inside TomKat's Wedding

Nov. 14, 2006 — -- With four days until their wedding, Tom Cruise and Katie Holmes are now in Italy.

Seven-month-old baby Suri and Tom's two adopted children, Isabella and Connor, have come along for the nuptials.

On Saturday, the couple are set to marry in a Scientology ceremony reportedly being held in a 16th-century Italian castle northwest of Rome.

Despite reports that Katie's parents were upset when she converted to Scientology, ABC News has learned that Katie's father will give her away.

The 27-year-old Katie will wear a wedding gown made by one of the wedding's guests, designer Giorgio Armani.

Other stars planning to attend the event are actor Will Smith and wife Jada Pinkett Smith. Andrea Bocelli, the famous tenor from Tuscany, is expected to perform.

But the ceremony itself may upstage the wedding's A-list attendees.

"People are fascinated by this Tom and Katie wedding, not just because they're celebrities but also because there is sort of this mysterious Scientology element to the wedding," said Katrina Szish, contributing editor of celebrity magazine Us Weekly. "People are used to any other type of religious wedding. But Scientology is always sort of shrouded in mystery."

According to Bob Adams, a vice president of the Church of Scientology, Scientology weddings aren't all that different from other types of nuptials.

"It is very traditional in its model. It's set up the way most traditional weddings are from various religions," Adams said.

A Scientology wedding looks much like a typical Christian one: bridesmaids on the left, groomsmen on the right.

The ring bearer and flower girls play a part. At the center of the wedding are the maid of honor, the bride, the groom, and the best man.

But the vows of the nuptials are in a category all their own. Scientology offers four types of ceremonies.

For Tom, the more traditional sermon would go like this: "Now Tom, girls need clothes and food and tender happiness and frills. A pan, a comb, perhaps a cat."