Chris Brown’s 34th birthday celebration, hosted by Usher at the Skate Rock City in Las Vegas, reportedly turned chaotic after the “Run It” singer got “disrespectful” with Teyana Taylor for unknown reasons while intoxicated, according to a close source reports Hollywood Unlocked. Guests, including Usher, tried to calm things down, but Chris allegedly called Usher a “coward” and left the venue, with Usher following him outside to talk.

Shockingly, Chris and his crew allegedly jumped Usher outside his bus, leaving him with a bloodied nose. Neither Chris, Usher nor Taylor have responded to the report. The incident is particularly surprising since the two R&B superstars are known to be good friends, with Usher bringing out Chris during his show in Las Vegas last year to praise and embrace him.