Apparently keeping a close watch on celebrity relationships with previous advice given to Kristen Stewart and Robert Patterson, Donald trump Yet again consults Pop idol Katy perry about the person she sees, But this is just no man who is the potential date it happens to be musician John Mayer.  "@katyperry is no bargain but I don't like John Mayer," Trump tweeted Friday. "he dates and tells--be careful Katy (just watch!)."  Bring a valid point from John's kiss and tell reputation with Jeniffer Aniston and also "Crack Cocaine like sex" with Jessica simpson. Mayer has apologized publicly for this.