Hayden Panty Err: Hayden Panettiere tried to spark interest in her quickly forgotten movie, "I Love You, Beth Cooper," by talking up her pivotal towel-dropping locker room scene. "If I can't flaunt it at 20, come on!" she said. "I mean, I might as well show it now." And that she did, just not in the PG-13 flick (she exposed only her bare back). The bronzed "Heroes" starlet plays peek-a-boo for a chat with David Letterman, sporting a wispy black lace minidress that is strategically opaque over her private parts, a design element that makes it nearly impossible to focus on anything else. Unfortunately, such close inspection exposes a secondary problem beyond a cutie-pie actress trying to get some attention in a daring dress. Turns out Hayden forgot the first rule of see-through: A wholesome white bra and panties are a contradictory no-no. On the plus side, at least she remembered the second rule of see-through: Always wear a bra and panties.