Last night Yves Saint Laurent premiered its latest fragrance ‘Belle D’Opium’ in New York City and threw a swanky party to celebrate it.

Many stars attended including Ashley Olsen.

Normally I don’t stop to pay much attention to the Olsen’s, but I must say I do love her turban. It brightens up what would’ve been a very dull look.

Maggie Gyllenhaal looks stunning wearing a sweetheart neckline pink chiffon YSL Edition Soir 2010 dress which she paired with Yves Saint Laurent Hamptons Tribute sandals.

Whitney Port has fallen in love with Yigal Azrouël Spring 2010 collection as she’s wearing her second piece.

This time she wears a black Yigal Azrouël cut-out jersey dress, with black pumps and a black Giuseppe Zanotti bag.

Alexa Chung – who was the DJ on the night – was of course in YSL.

She wore a pair of leather slashed shorts from the Spring 2010 collection.

I love the simple grey tee, but I the Mulberry bag and that granny cardigan has to go.

Credit: Style.com & Getty