NEW YORK - JUNE 17: TV personality Alexa Chung attends the YSL Belle D'Opium fragrance launch at The YSL Stage on June 17, 2010 in New York City. (Photo by Jason Kempin/Getty Images)

The stars flocked to the launch of YSL's new fragrance, Belle D'Opium, in New York last week. Joining them was Alexa Chung, who wore a pair of YSL high-waisted leather shorts, casual T-shirt, white cardigan and brown leather handbag. Also at the launch was Ashley Olsen (sporting a YSL turban no less), Whitney Port and Maggie Gyllenhaal - see what they wore after the jump...

NEW YORK - JUNE 17: Ashley Olsen attends the YSL Belle D'Opium fragrance launch at The YSL Stage on June 17, 2010 in New York City. (Photo by Jason Kempin/Getty Images)


NEW YORK - JUNE 17: TV personality Whitney Port attends the YSL Belle D'Opium fragrance launch at The YSL Stage on June 17, 2010 in New York City. (Photo by Jason Kempin/Getty Images)


NEW YORK - JUNE 17: Actress Maggie Gyllenhaal attends the YSL Belle D'Opium fragrance launch at The YSL Stage on June 17, 2010 in New York City. (Photo by Jason Kempin/Getty Images)