is it john mayer, joe jonas, taylor lautner or jake gyllenhaal?ith jake gyllenhaal? people sort of speculate. they imagine. they think they get clues. >> they kind of draw their own stories. >> reporter: you're wearing a scarf in a music video, and everyone's like, gee, that scarf looks like the scarf she was wearing when she was photographed with jake gyllenhaal, perhaps -- >> you know -- >> reporter: it's funny right? >> for me, the one thing that i keep really close is the identity of who these people, who these songs are really about. >> reporter: is it sometimes hard to get people to come into your world? because i don't know, if i hung out with you i'd be a little afraid you were going to write a song about me. >> the only time it's been an issue was when i was, like, going through a really bad breakup with a guy, and he's like, "you better not write about this." and i'm like, "oh, i won't." >> reporter: did you? >> yes. >> reporter: do you ever hear from these people who maybe recognize themselves in a song, and are like, "hi, guess what, i