Pop star KATY PERRY was left fuming backstage at the MTV Europe Music Awards on Thursday (06Nov08) after spotting a group of women flirting with her boyfriend, rapper Travis McCoy.

The I Kissed A Girl hitmaker, who hosted the ceremony in Liverpool, England, reportedly became angry when she saw some girls touching the Gym Class Heroes frontman's piercings and tattoos.

According to British tabloid reports, Perry glared at the girls before saying, "Why don't you whores just p**s off?"

But the singer need not have worried about McCoy cheating on her - because he is totally besotted with Perry.

A source says, "Katy may have been the woman of the moment at the awards but that didn't stop girls flocking round her man.

"Travis was presenting from the red carpet and also got up onstage, so he was in the spotlight too. Plus he's massive in the States.

"Katy had nothing to worry about though. Travis only had eyes for her. He was constantly stroking her hand and being all touchy-feely. After she told those girls to p**s off, Travis refused to make eye contact with a single female in the room."