El Biebo was encouraged to try a vegan lifestyle by his mentor and fellow pop titan Usher, but it seems a meat-free diet didn't really agree with him.
“His mood took a major nose dive — he was such a brat," an insider told Star magazine. "Soon everyone was begging him to just eat a steak!
“Justin ordered a tofu steak and tempeh tacos from Real Food Daily in L.A. and was really grossed out. He made a big show of spitting out the food and making gagging noises.”
And it all got too much for Selena apparently - the snitchy source added:“She had encouraged the health kick but told him to drop it. She said that being vegan turned Justin into a jerk.”
Hmm, could this lack of meaty goodness be to blame for the J-Dawg's run in with the paparazzi, and perhaps even his airport-based rant at his fans?