According to the Daily Mail it was Katy Perry who was not ready to settle down and start a family. And they seem pretty legitimate since they have the divorce paperwork:
Apparently Katy Perry was too caught up in being famous and being Katy Perry and she wasn’t ready to settle down, and she put her career ahead of family whereas Brand was ready to start a family. This is quite shocking, because we probably all expected that Brand would be the one to mess it all up.
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