Katy Perry not troubled by her ex

Katy Perry is 'not allowing' ex-boyfriend John Mayer to distract her from work.

The singer split from musician John in February, after he cheated on her. She is currently preparing for her Prismatic World Tour and her only focus is regarding how to put on good shows for her fans, regardless of her painful breakup.

"Katy is focused on her tour right now" a source told E! Online. "She is not allowing anything to distract her from it".

In fact, Katy looks to be on cloud nine regarding her music career and the tour that will start next month.

"She is in great spirits right now", the insider detailed.

Apparently her forthcoming tour was the reason they split. But also, they had verbal disagreements.

'She's stressed about the tour, they've been fighting. It is probably for the best, because she is going to be on tour for forever. Of course this happens all the time, I can't keep track anymore. But for now they are done', an insider told Us Weekly previously.

She took him back each time after a break-up, in the past. Now she is determined to stop doing that.

"They had talked about marriage and she seemed to think he was a changed man, so she is beyond gutted", a source told British magazine Grazia recently. 

"[But] she doesn't want to find him attractive anymore".

Her tour will have its debut on May 7 in Belfast, Northern Ireland.