ELLEN POMPEO hosted a fun at-home lingerie party attended by "Grey's Anatomy" costars KATHERINE HEIGL, SANDRA OH and KATE WALSH, and the ladies had a blast trying on a line of sexy frillies sold by a pal of Ellen's. But being sexy can make a gal hungry, so they ordered pizza. When the doorbell rang, Ellen found a good-looking 20-year-old guy on the doorstep and asked, "Would you mind giving us your opinion about something?" The guy, a college student, was treated to an impromptu fashion show starring four gorgeous women prancing and preening in nighties and skimpies. Pizza Boy, pie-eyed by it all, was asked to judge which outfits would get a man's motor racing. Afterward, Ellen tried to tip the guy, but he refused, saying, "This is the best tip I've ever had!"