The singer was enjoying her 'Prismatic World Tour' stop in Sydney, Australia, until the Australian paparazzi made things a little uncomfortable for her.
Of course, there is a big difference between sharing a photo that your friend snapped and having photos taken by random people that you don't know.
Katy went on to put some of the individual paps on blast, posting their pictures and referring to them as "the stalkers."
The "Dark Horse" singer wasn't done just yet. She also posted this angry message, which she hoped would discourage any outlets from using the photos:
THESE ARE A FEW OF THE STALKERS: pic.twitter.com/1JtHSIVuqc- KATY PERRY (@katyperry) November 22, 2014
Katy is certainly not the first celeb to get mad at the paparazzi and we're sure she won't be the last. Check out the gallery below to see other celebs who have lost it on the paps.
Remember AUS anyone printing or posting unauthorized photos of me in a bikini from these DISGUSTING/PERVERTED OLD MEN is AGAINST my will!- KATY PERRY (@katyperry) November 23, 2014