May 28, 2012 12:10 AM
Justin Bieber lost his cool with a paparazzo today as the photographer allegedly blocked the pop star's car as Bieber and girlfriend Selena Gomez tried to leave a movie theater in Calabasas.
The pap called 911 and complained of pain in his chest. Our photographer who was there, tells us Bieber's bodyguards said JB was "using the moves [I] taught him."
Bieb's bodyguard scuffled with a paparazzo at LAX back in February when a photographer reportedly refused to stop taking pix of the star.
Justin lost his shoe in the today's altercation and Selena tried, unsuccessfully, to intervene. After the incident, the police were called in, as was an ambulance. It's unclear whether either side will press charges.
SEE THE GALLERY Justin Bieber Loses His Cool With A Pap