She should have done this way before... If she someday works with him it would be really awkward after claiming 'Music not the bling". It would mean "Ok I said that once but you know I need to eat so..."
Honestly she's in a tough place. After all she claimed I can only picture her working with underground producers.
That's why she worked with "Uptown Funk" producer, "Sorry" producer...
Not to mention David Guetta and will.i.am on ARTPOP
She worked with them for good productions.
If Max Martin and Gaga manage to create an even better yet riskier song than PI I'm here for it. If I wanted to hear Katy songs I would just listen to Katy, though.