It seems Lady Gaga is taking this rap thing seriously. A Terry Richardson-directed teaser video for her trap-rap song, "Cake," was released on Wednesday (Nov. 14). The brief lo-fi clip finds a lingerie-clad Gaga letting another girl slap her ass in a hot tub, then solo, dropping it low in front of a mirror. Scandalous. But really, the question is how much rapping will she be doing on her upcoming album ARTPOP?