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).

PHOTOS: Celebs at the royal wedding

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.

Video: See Kate's historic entrance

While tradition dictates that guests should never wear white to a wedding, did just that in her form-fitting cowl-neck dress, which was accented with small silk-covered buttons in the back. Commemorate Will & Kate’s big day with our Us Collectors Edition: Royal Wedding with all the photos, anecdotes and details of the wedding. Available for pre-order now and on sale May 6. 

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