[ LIFESTYLES ]

Zac Posen designs are equally beloved by downtown fashionistas,smart Hollywood starlets -- even Oprah, who wore one of Posen'sprinted frocks on the cover of O, the Oprah Magazine, back inDecember and then special-ordered another. Other A-list aficionadosinclude:

Natalie Portman

Claire Danes

Madonna

Naomi Campbell

"Hairspray" star Marissa Janet

Winokur

Angelina …