To quote former boyfriend (and frequent Tiger Beat cover fodder) Joey Lawrence, "Whoa!" Katherine Heigl is one hot little momma who is humongous in two very important places. Kat first caught the eyes of skinthusiasts in My Father the Hero (1994), spending the majority of the movie in a skimpy white swimsuit. Three years later this tan teen filled up and out and showed the results of her growth spurt (particularly her bare royal rump) in Prince Valiant (1997). Kitty made 100 Girls (2000) a million times hotter when she lost her shirt in a foosball game and tickled tongues with Kewpie-doll co-star Larisa Oleynik. Katherine brought her out-of-this-world beauty to millions of flesh fans on the now-defunct teen TV series Roswell before returning to skin and sin in 2005, when she dared to bare some side funbag in Side Effects. Very effective, indeed. Nowadays, you can get a weekly dose of Heigl on the doc drama Grey's Anatomy. While there's no nudity on network television, she's often skimpily clad in the hospital locker room, showing off her Great Anatomy. Katherine officially went from boob-tube beauty to A-list big-screen starlet with her knockout leading-lady performance in the blockbuster comedy Knocked Up (2006).