Thanks to everybody who made suggestions as to who would be a good opponent for Katy Perry; it's a long list, I'll try going through it in the long run, haha.
So, the First Lady battling her in a catfight will be Jennifer Lawrence.
The two ladies meet in a private gym, with only a small number of select spectators.
Katy makes her appearance in her latest stage outfit, a most appropriate choice for the occasion.
Jennifer arrives in not less impressive style, showing off her athletic body.
Shortly after they meet, Katy suggests to Jennifer she might have been too old for a childish play suit since very long; Jennifer doesn't hold back and tells Katy she looked like a Scottish milkmaid who gets her arse whipped.
The ensuing trash talk in which they ridicule each other in more and more vulgar terms leads up to a competitive comparison of each other's boobs. Being of equal height, Katy and Jennifer stand there bust on bust, making their boobs touch...
Jennifer: 22 years, 5'8", 62kg
Katy: 28 years, 5'8", 59kg