The 27-year old, who split from Brand last December, has hit back at criticism after she pulled two topless men on stage with her during her final California Dreams tour dates in Indonesia and the Philippines.
After selecting the two men, Perry kissed one of them on the cheek and grabbed the other man's nipple.
Speaking of her stage smooching - which has been a regular feature throughout her world tour - Perry tweeted: "Btw, I have *kissed* 1 boy, picked randomly out of the audience, on the cheek as a part of my show for all 125 tour dates. Simmer down now."
In other related news, Russell is thought to have turned down Katy's pleas to save their 14-month marriage, with a source telling The Mirror: "She has been quite down. She really thought she could sort it out with Russell.
"Even with the divorce papers being served she was convinced that a meeting could make him realise why they fell in love."
The One That Got Away star has since unfollowed the comedian on Twitter, while Brand is currently still keeping an eye on Katy's updates on the social-networking site