We're two weeks into American Idol, and Jennifer Lopez is already breaking out the glam cocktail dresses! This week, Lopez took a seat at the judge's table in a peek-a-boo polka dot design from Stella McCartney's fall 2011 collection. Fun fact: Kate Winslet wore the same dress to a Mildred Pierce screening last year. Tune in to Fox on Wednesday, February 1st at 8/7c to to catch more of Jennifer Lopez’s American Idol style moments, and click through the gallery to browse her hottest looks from this season!MORE:American Idol Stars TransformPia Toscano’s Post-American Idol StyleJennifer's Hottest Season 10 Looks