Kate Middleton Sparks More Dress Speculation at Royal Wedding Rehearsal

AP Photo/Kirsty Wigglesworth

She wears a train -- causing rumors to fly online about what she'll don to wed Prince William.

Kate Middleton rehearsed for her wedding to Prince William on Friday.

The queen-to-be was joined by her five bridesmaids, who held fake bouquets, her mom, Carole and her future brother-in-law Prince Harry. Her fiance, Prince William, was on duty with the Royal Air Force that day, so was not in attendance.

Middleton donned a long train as she walked down the 300-foot aisle to the altar at Westminster Abbey -- causing even more speculation online about what type of dress she'll wear April 29 to say "I Do."

Palace spokespeople downplayed any similarity between the rehearsal and the big day.

"Obviously the props used were not the ones they will have for the wedding," a royal aide told the U.K.  Sunday Express. "'A train is a train but the actual size, length and design will only be revealed on the day."

A Clarence House spokesman said the dry run was "one of many" before April 29's wedding, which will air live worldwide, and could be watched by more than a billion people.