Credit: AMH/; Steve Granitz/

That looks familiar!

When Pippa Middleton stepped out for her big sis' royal wedding style experts experienced a fashion flashback. That's because the 27-year-old's ivory Alexander McQueen dress looked almost identical to the one Cameron Diaz wore to the Golden Globes (also by McQueen, but in red).

No word if the maid of honor was inspired by the A-list star's red carpet look, but one thing is certain: with her stunning figure and huge smile, the younger Middleton, who was named the No. 1 Society Singleton by Tatler in 2008, received almost as much attention Friday morning as the bride.

While tradition dictates that guests should never wear white to a wedding, she did just that in her form-fitting cowl-neck dress, which was accented with small silk-covered buttons in the back.

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