One of those stars was Justin Bieber who sang some of his emotional tracks to a sold-out crowd on Sunday night.
During the performance, Justin struggled to fight back tears as he paid an emotional tribute to those who lost their lives.
“I just want to honour those who were lost, those that were taken from us,” he tearfully said.
“We love you so much, to the families we love you so much. Put both hands up to honour those people right now.”
The benefit concert is expected to raise around US$2.6 million.