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13 "Kate Middletons" on Parade in London

January 19, 2011 / 3:06 PM EST / CBS News

group of students from the Royal College of Art pose for photographs wearing Kate Middleton style engagement outfits they made themselves and engagement rings outside Buckingham Palace in London, Wednesday, Jan. 19, 2011. The group carried out the stunt for fun ahead of the wedding of Britain's Prince William and Kate Middleton in 100 days time on April 29, 2011. (AP Photo/Matt Dunham) — Students from the Royal College of Art pose for photographs wearing Kate Middleton style engagement outfits they made themselves outside Buckingham Palace in London, Wednesday, Jan. 19, 2011. (AP Photo/Matt Dunham)

LONDON (CBS/AP) In a piece of performance art to mark the 100 days remaining until Britain's royal wedding, some 13 "Kate Middletons" paraded in front of Buckingham Palace Wednesday.

The unannounced arrival of the wannabes wearing identical copies of the dark blue dress Middleton wore when her engagement to Prince William was revealed, gave tourists a jolt. Their "`Kate look" included replicas of her famous diamond-and-sapphire engagement ring.

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The women are students at the Royal College of Art in London who clearly enjoy making a splash.

The 29-year-old Briony Clarke, remaining in character as Middleton says "I thought it was time I got with my people.''

The real Middleton, who just turned 29, will marry Prince William on April 29, 2011, in a ceremony at Westminster Abbey.