may not have heard of. you should. six-time grammy nominee bruno mars. ♪ just the way you are >> i ask him the questions few others have dared to put to him. what's the worst song you've ever written? if i could take away the money or the women, which would you rather keep? >> definitely the women, piers. what kind of question is that? what is this, a setup? >> bruno mars, the man, his music. probably the biggest pop star in the world right now. this is ""piers morgan" tonight." >>> white house staffer, he played one on tv. it may be my favorite series of all time, the west wing. he's a politics junkie. rob lowe joins me. how are you? >> i'm great. >> you must be excited because last time i interviewed you, politics is seeping through your veins, isn't it? >> look, this is one of my favorite times of year. iowa caucuses going into new hampshire. it's good. i've been watching a lot of you getting my info. >> it was an amazing night in iowa.