There was no shortage of star power at Yves Saint Laurent on Monday night.
As for what they were wearing, each lady showed off their own unique style.
Katy opted for an army green YSL jacquard dress and leather motorcycle jacket, Salma donned a black and tan leather trench, Alicia kept warm in a lush white fur coat worn over a black top and pants, and Rosario kept it simple with a black trench and dress.
Which celeb do U think was best dressed???