Princess Diana's Wedding Dress Designer Dishes on Pippa Middleton's Gown!

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Pippa Middleton is engaged — so what will she wear on her big day?

In a new interview, the co-designer of Princess Diana's iconic wedding dress suggested Pippa, 32, should steer clear of a gown that resembles the dress her older sister, Kate Middleton, donned at her 2011 royal wedding to Prince William.

Kate and Pippa at Kate's 2011 royal wedding. (Photo Credit: Getty Images)

"I personally, would put her in something very soft, perhaps chiffon, with a train of course because it's dramatic. Possibly a little lace bodice, soft and fluid, I mean she's got a great shape," David Emanuel told the Daily Mail.

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"And I would say the complete opposite of Kate just so she makes her own statement really. Soft and pretty," he added.

Diana at her 1981 wedding to Prince Charles. (Photo Credit: Getty Images)

In another interview, style expert Hilary Alexander revealed Pippa will likely choose a British designer to create her wedding gown. "She could go for something lavish and romantic by Marchesa or upmarket luxe by Ralph & Russo," Alexander said.

Pippa announced her engagement to hedge fund manager James Matthews, 40, on Sunday, July 17. We can't wait to see what she wears on her wedding day!