If I Knew Song Lyric by Bruno Mars Artist(s) : Bruno Mars , Song Title : If I Knew , Album : Unorthodox Jukebox Oh, oh, oh I, I was a city boy Riding to danger's where I'd always run a boy who had his fun But I wouldn't've done All the things that I have done If I knew one day you'd come Now baby, now baby, now baby, now baby Oh, oh, oh, I, I know it breaks your heart To picture the only one you wanna love In someone else's arms But I wouldn't have done All the things that I have done If I knew one day you'd come Now, baby, now, baby, now, baby Oh, baby, please Let's leave the past behind us, behind us So that we can go where love will find us Yeah, will find us I know most girls would leave me But I know that you believe me Baby, I, I wish we were seventeen So I could give you all the innocence That you give to me No, I wouldn't have done All the things that I've done If I knew one day you'd come If I kne