According to BBC News, hundreds of spectators took to nearby roads to catch a glimpse of the Rude Boy singer in action.
But things went south when Rihanna switched outfits, before finally peeling off her barely-there clobber and going completely topless. At which point a disapproving Graham pulled up on his tractor and called a halt to the X-rated show.
"The state of undress was becoming inappropriate," the father of four told the Associated Press.
"I thought it was inappropriate. I requested them to stop and they did," he said.
Graham, who is a member of the Protestant, conservative Democratic Unionist Party (DUP), also admitted he was not "familiar" with Rihanna's work. He said had no idea who she was when he received a call last week asking to use the field.
He added: "I didn't know who was coming. If the name Rihanna had been mentioned, well, no disrespect but it wouldn't have meant anything.
"Someone explained she was as big as it gets as far as pop stars were concerned," said Graham, according to the Daily Mail. "I am a bit illiterate about those issues."
Graham added: "If someone wants to borrow my field and things become inappropriate, then I say: 'Enough is enough. You are not entitled to do that.'"
But despite Rihanna's impromptu flesh-flashing, the farmer said he had no ill-feeling towards the singer.
"I had my conversation with Rihanna and I hope she understands where I'm coming from," he told BBC. "We shook hands."
He added: "I wish no ill will against Rihanna and her friends. Perhaps they could acquaint themselves with a greater God."
Graham's wife (who declined to give her first name) also spoke to CNN about boob-gate.
She said: "What she was doing became more inappropriate. When she started to go topless, that's what Alan was particularly objecting to - things were getting out of hand. There was a man as well, and the behaviour was getting more inappropriate. It wasn't the sort of thing Alan wanted young people (those watching) to see on his land."
The video shoot later resumed in a different location, according to reports.
Click here to see snaps of Rihanna frolicking in the farmer's field.
What do you guys make of Rihanna's cheeky antics?
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