January 27, 2013

Justin Bieber performs at the AT&T Center as part of his Believe tour, on Jan. 12, 2013. Arnold Wells/WENN.com

Teen heartthrob Justin Bieber has once again found himself on the wrong side of the law after a trip to Ottawa, TMZ.com reports.

The popular gossip site says a woman has filed assault charges against Bieber after she was hit by a projectile when he performed at Scotiabank Place in November.

And the weapon of choice? Well, a Nerf gun, apparently.

The woman says she was hit by something while she was working as a security guard at his show.

Sources told TMZ.com the "Boyfriend" singer was in a pitched Nerf battle with his two younger siblings -- Jaxon, 3, and Jazmyn, 4 -- when one of the darts flew off course and hit the woman.

She allegedly lost her cool and flipped out on the pop star.