Justin Bieber broke down in tears after paying tribute to the victims of the Paris attacks .
The singer was performing a gig in LA last night as news of atrocities in the French capital unfolded.
He led prayers on stage and then broke down as he sang 'I'll Show You' for the audience.
Justin, 21, could be seen with tears streaming down his face as he said over and over again: "We're in this together"
"Why am I crying so hard?" he asked, before adding: "Get it together, Justin."
His voice broke as he said: "I've got to go, thank you," before walking off stage.
After the gig he posted a picture to Instagram of him crying and wrote: "Tears are healthy."
He earlier wrote: "My love, prayers and thoughts are with the families of this horrible tragedy. #prayforparis."
He is just one of a number of stars who have spoken to send their support to the city and the families of those who were killed in the devastating attacks.
Celebrities, politicians and sports personalities flocked to Twitter to offer their thoughts and prayers to everyone involved in what's being described as the deadliest violence to hit France since World War 2.
#Prayers4Paris featured in thousands of tweets that flooded the social media site on Friday as it emerged at least 120 people lost their lives after a series of shootings and explosions in the French capital.
Dozens of celebrities shared pictures of a peace sign made to look like the Eiffel tower and also pictures of the French flag alongside messages.