The iHeartRadio Music Awards saw many, many celebs strut their stuff and do their celeb thing.
Katy Perry was among those celebs, and apart from smiling with heaps of quinoa in her teeth, she did something to make teen heart-throb Shawn Mendes real uncomfortable.
While Shawn was doing a Facebook Live interview, he suddenly turned around because Katy had grabbed his butt.
"Someone was just touching my butt. Sorry. Oh, it was Katy Perry who was touching my butt. I should have turned around," he apologetically told the interviewer.
It seems light-hearted, but Shawn continued, saying, "sorry, I'm just stunned. I've never met her before."
Many fans have come out and called the incident out as a double-standard, saying if Shawn grabbed Katy's butt, it would be such a big deal.
"This is assault... it's not even cute or funny if the roles were reversed and it happened to a woman y'all would be so pissed..." one fan wrote.
"I'm confused as to why people think it's okay that Katy Perry touched Shawn Mendes' butt, because that doesn't sound ok to me," said another.
The interviewers talking to Shawn at the time asked him, "what if you grabbed her butt back?" and he replied, "no, I cannot do that. That's not good. That's not a game. That's not a joke."
Obviously we don't think Katy meant it as sexual harassment, but the people raise a damn good point.
Just don't go touching people's butts, K?