People.com Halloween Party

Stars Dressing Up as Stars

From Miley Cyrus as Lil' Kim to Queen Latifah as Oprah, see which celebs are channeling their A-List peers this holiday

KELLY OSBOURNE: CHRISTINA HENDRICKS

Christian Siriano made the lucky Fashion Police host an identical replica of the red-carpet dress he designed for the flame-haired Mad Men star, but the style expert admitted she needed a little help to achieve the actress's famous curves, confessing on Instagram, "I had to wear 3 bras!!"