According to The Sun, Brand - who announced he had filed for divorce from Perry last month - is said to have upset the Hot N Cold hitmaker by 'failing to control himself' around her pastor parents, Keith and Mary Hudson.
A friend of the couple told the newspaper: "Russ was forever making lewd jokes at the dinner table and poking fun at her parents' beliefs. He managed to restrain himself in the beginning - just.
"But as the marriage progressed, he got worse and kept winding up her family. After the lust wore off, reality hit home about their differences and [Katy] was left thinking, 'What have I done?'"
Katy's parents have since addressed the breakdown of their daughter's 14-month marriage, telling worshippers at their first service since the split that her divorce was 'a gift from God' to help them fill churches.
The Sun reports that Mary told the packed Church on the Rise congregation in Ohio: "I'm sure Katy is trending on the internet just to get you to church tonight.
"I mean all over the world, who knows how God is bringing them in? The most important thing is you are here and God wants to put the fire in you in 2012."
It is thought Perry requested that Russell file the papers to end their marriage as the 27-year old did not want to upset her folks by initiating divorce proceedings.
Watch MTV News on the hour every hour on MTV - Sky Channel 126 and Virgin Channel 134