Mental Note - Don't call Jason Derulo "Usher" because he'll fight you!
It appears from several eye witness accounts that 2 men were harassing Jason Derulo at the ARIA hotel in Las Vegas.
They were passing Jason Derulo on an escalator and one of the guys allegedly said "Hey Usher... F*** You B****!"
Jason was with a bodyguard but still took matters in his own hands and he attacked the man calling him "Usher."
Derulo then slapped the other man that was with him before security broke up the scuffle.
Jason wasn't arrested and the men haven't pressed charges just yet.
They have one year to file a lawsuit.
EVERYTHING was caught on video and fans have been responding on social media all day on the incident.