Justin Bieber under investigation for assaulting men in two separate incidents

It's been a busy week for the Biebs.
Photo: Jason Merritt / Staff - LOS ANGELES, CA - NOVEMBER 13: Singer/songwriter Justin Bieber performs onstage during An Evening With Justin Bieber at Staples Center on November 13, 2015 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for Universal Music)
Pulse of Radio
Feb 17 | 12:21 PM EST

Justin Bieber is under investigation for head-butting a man at a pre-Grammy party last weekend, TMZ reports. The fight went down at 2 am on Saturday at Serafina in L.A. where the pop star's pal Poo Bear was hosting a party. Eyewitnesses tell TMZ that Bieber was "play fighting" with his friend Kyle Massey.

Trouble started when he realized staff at the restaurant were taping the action, with Justin eventually lunging at him and head-butting him.

Another staffer called the L.A. County Sherriff's Department. The investigation is ongoing.

It has been a busy week for the Biebs.

A Las Vegas man who claims Bieber assaulted him in Cleveland eight months ago filed a police report about their dispute this week.

Rodney Cannon, 34, claims in a report filed with the Cleveland police on Tuesday that the pop star took his sunglasses at a hotel after a Cleveland Cavaliers playoff game on June 8th.

Cannon claims that in addition to swiping the glasses, Bieber and possibly a bodyguard punched him. In the ensuing melee, Cannon allegedly managed to wrestle Bieber to the ground and restrain him.

Still, the alleged victim claims he was taken to the hospital with various injuries, including a concussion.

Police say the incident is under investigation but no charges have been filed.