17 Celebs Who've Posed Nude Natalie Portman's Dior ad is the latest By Evann Gastaldo, Newser Staff Posted Aug 26, 2012 11:50 AM CDT 4 comments Comments Actress Natalie Portman arrives before the 83rd Academy Awards on Sunday, Feb. 27, 2011, in the Hollywood section of Los Angeles. (AP Photo/Chris Pizzello) (Newser) – Natalie Portman showed off her post-baby body recently in a bare-skinned ad for Christian Dior. The Rouge Dior Nude Lipcolour ad features the 31-year-old topless on a couch—positioned, of course, so you can't actually see anything too private. Celebuzz rounds up 16 more celebrities who've gone sans clothes in print: It's not just women. Adam Levine wore nothing but his tattoos in a Cosmo spread raising awareness of prostate cancer. Model Alessandra Ambrosio went naked while pregnant to shill for Vivara jewelry. Jennifer Aniston went topless in an effort to convince you to purchase SmartWater. Jennifer Lopez's naked body does appear to actually glow in an ad for her Glowing perfume. Even former Scientologist Katie Holmes bared quite a lot of breast in an H. Stern jewelry ad. Paris Hilton is naked and way, way tan in an ad for her line of champagne. Click for the complete list—and pictures, of course—which includes one singer who went naked with the exception of … tiny men crawling all over her.