Last night at the American Ballet Theatre's spring gala, Calvin Klein designer Francisco Costa said he thought Michelle Obama has "great taste," stylewise. Michelle attended last night wearing a dress by Azzedine Alaïa. Would Costa try to talk her into adding Calvin to her clothing repertoire? "Yes, of course I will," he said. "Why do you think I’m here? I bought a tuxedo for her." Related: View our Party Lines slideshow.