Demi Lovato Interviews: Demi Lovato 'untouchable in Ashley Greene conversation: Earlier Tuesday, we published some rare thoughts by Ashley Greene in an interview with Teen Vogue when it came to her relationship with Joe Jonas. Even though the "Twilight" actress may have been willing to talk about this, though, does not mean that she was equally open about Joe's ex Demi Lovato.

During the exposition for the interview, the publication noted (per E! News) that "[the] alleged fight [involving Demi, Ashley, and Joe] is one of the few topics that Ashley's publicist has declared to be completely off-limits." Back after Lovato made the decision to enter a treatment facility, there were all sorts of rumors floating around about whether or not she was upset with Ashley being present on the Jonas Brothers tour, or if there were jealousy issues. Really, no one was really able to put any truth to any of this discussion at all -- and it seemed really just like desperation in order to capitalize off of Demi's fame.

With that in mind, this is probably why Ashley opted against talking about the subject -- why feed into rumors that only end up bringing on more negative attention.