The former Spice Girl was having none of it, and after the crowd made sounds of shock at the remark, she removed the lid from her Dunkin Donuts cup and launched the contents at Cowell before walking away.
The former Spice Girls singer filed for divorce in March, after 10 years of marriage to 42-year-old film producer Stephen Belafonte, with her representatives accusing Belafonte of "emotional and physical abuse". "So much went wrong but that's what makes live TV so cray (crazy)!"
I think it's plain to see, Johnny is a rising star and there's no doubt he will be going places, no matter what happens on America's Got Talent. Acts can either perform at a live show or they can't.
Mel reportedly did have one regret following the public spat, sharing, "I just [wish] I would have had cranberry juice in there or something, and then his whole body would be really sticky!" She previously did it during Week 5 when he made a backhanded compliment saying she deserves more credit for being so successful despite not knowing how to dance.
"I told him he was an arsehole", she said.
Cowell's joke could be considered poorly timed, given recent developments in Brown's love-life.
"I'm single", she said.
"The act before made me cry, because it's all about dads and cancer and I just lost my dad".
Simon Cowell quickly gained a reputation for being the brutally honest and brashly offensive judge during his days on American Idol, and it seems as he's taken the infamous trait over to his latest gig at America's Got Talent.
During the quarterfinals of the 12th season of America's Got Talent reality show competition, singer Johnny Manuel's performance provoked a standing ovation from the quartet of judges.