Singer Miley Cyrus, who kissed Katy Perry impromptu at a recent gig, has reacted strongly to the latter's comment on the episode, and asked where Perry's 'tongue has been'.

During her Bangerz World Tour, Katy Perry refused to let Miley Cyrus go 'deeper' when the latter kissed her, and she justified her decision of pulling back during an Australian television appearance this week.

Miley Cyrus hit back at Katy Perry by posting a controversial comment on Twitter saying, "Girl if you're worried about where tongues have been good thing your ex boo is ur EX BOO cause we ALL know where THAT has been", reports mirror.co.uk

The "Party in the USA" singer also tweeted regarding infidelity issues - something that may upset Perry, as her split from John Mayer has been linked to cheating.