This week was all about grown-up glamour. And the winners are...

Kate Middleton (aka Catherine Duchess of Cambridge) in Sarah Burton for Alexander McQueen on her royal wedding day. There was so much speculation about Catherine's gown that I was afraid to see her final gown choice for fear that it would dissappoint. It didn't. The sweetheart neckline and V-neck, lace overlay added just enough drama to this otherwise classic wedding gown, which is no doubt fit for a princess.

Pippa Middleton in Sarah Burton for Alexander McQueen at Catherine's royal wedding. Pippa, Kate's younger sister and maid of honor, might not have managed to upstage the princess, but she sure managed to capture a lot of hearts in this ivory satin-based crepe dress, which came across as being mature without being matronly (I love that she wore the same designer as the bride!).

Iman in Jason Wu at the CFDA/Vogue Fashion Fund Awards. The supermodel and entrepeneur looked fierce in this feminine fuschia gown, which featured flirty frills along the neckine. She accessorized with turquoise drop earrings. 

Blake Lively in Zuhair Murad Couture at the Time 100 Gala. The "Gossip Girl" star reminded me of a modern-day mermaid in this seafoam and cream, ombre gown, which boasted beautiful embellishments along the bodice.

Kerry Washington in Catherine Malandrino at the Time 100 Gala. The actress pulled off this bold, abstract-print silk gown with flying colors, sealing the deal with a pair of gold peep-toe platforms.

Photos (left to right): Chris Jackson/Getty Images; Carl De Souza/AFP/Getty Images; Brian Ach/WireImage; Charles Eshelman/FilmMagic; Kevin Mazur/WireImage