Celebrity couple Billy Zane and Kelly Brook are to marry in Roberto Cavalli next year (06), as a returned favour from Egyptian millionaire Mohamed Al Fayed.

The TITANIC actor, 39, and The Italian Job beauty, 26, agreed to open the January (06) sale at Al Fayed's London department store Harrod's, so the grateful businessman has arranged for Cavalli to create Brook's wedding gown.

Al Fayed - father of DIANA, Princess Of Wales' companion DODI FAYED - is flying his friend Cavalli in on a private jet to oversee Brook's outfit for the opening, before he starts working on the gown for her special day next year (06).

She says, "It's an enormous honour for Billy and me. We didn't hesitate confirming that we'd love to do it. Harrods is such a fabulous store and I have enjoyed endless hours shopping there."

Al Fayed's spokesman says, "We are absolutely thrilled that Billy and Kelly are coming. Their attendance will add extra special magic to our unique event.

"Mr Al Fayed was particularly captivated by Kelly's charms when he first met her a few months ago."