The singer/actress was chatting to correspondent Dean Richards on America's WGN Entertainment network on Monday (22Jul13) when he mentioned Bieber's recent headline-grabbing antics.
He said, "You're... probably as close a friend to Justin Bieber as they come. Is there something about him that we don't get or we don't understand? I mean, there is one story after another of... pretty outrageous behaviour that we're reading about."
Gomez, who was appearing on the show via videolink, refused to answer the question and looked off camera to an aide, before the screen suddenly went blank.
The brunette recently sparked fresh reports of a reconciliation with the Baby hitmaker after previously splitting last year (12).
Bieber has hit the headlines for all the wrong reasons in recent months, showing up hours late for several gigs and falling out with his neighbours in California, while he has also faced allegations he spat in a Dj's face and urinated in a restaurant's mop bucket.