Pop star Katy Perry refused to let Miley Cyrus go "deeper" when the latter kissed her during her Bangerz World Tour.

Perry locked lips with Cyrus during her Bangerz World Tour last month, but pulled away after the latter attempted to slip her tongue inside her mouth, reports contactmusic.com.

"I just walked up to her to give her like a friendly girly kiss, you know, as girls do, and then she like tried to move her head and go deeper and I pulled away," said Perry.

"God knows where that tongue has been. We don't know! That tongue is so infamous," she added.