Lately, Justin Bieber has been flaunting his bare chest and an expert has revealed that this is simply a personal marketing strategy. Dr. Phil Dembo -- a therapist and parenting coach told Hollywood Life, "Justin Bieber is not only a singer, a performer and a celebrity, but he's a master at marketing himself and getting noticed. After all, he was discovered on YouTube. He knows what he is doing."The therapist added, "We have seen him recently deliberately alter his image from the youthful cute kid to the 'bad boy' image he is now creating. It's important for him to continue to make headlines and keep himself in the public eye."Meanwhile, Bieber showed up to the Griffin nightclub in NYC at around 2 a.m. Monday night (July 29th), but was declined access by security because he's underage.