Nicki Minaj demanded the grass outside her dressing room at T in the Park be cut shorter.
The 'Starships' hitmaker refused to walk around her private area at the Scottish music festival last weekend because the lawn had not been trimmed sufficiently and insisted someone tackle the greenery before she would step outside.
A source told The Sun newspaper: "Nicki went mad about the grass around her area, saying it was far too long for her to walk on.
"She threw a complete strop, pouting and pointing and asking someone to get a lawnmower to sort it out."
Nicki - who is also said to have made the same demand at the BBC Radio 1 Hackney Weekend festival in London last month - was later blasted on twitter by a fellow performer at the annual music event, which took place in Balado Park, Kinross.
Singer Frank Turner tweeted: "You can (I suppose) be a d**k to your own crew, you're paying them. But everyone else? Not to mention the people out front. Ugh.
"To clarify: Nicki Minaj has been a selfish s***head to all the hard-working crew backstage at T. Pathetic. F**k off."
The rapper also angered the crowd as when she eventually made it onto the stage 50 minutes late; her 30-minute performance was booed by fans after she appeared to be miming for much of it.
One fan said: "We were buzzing for the gig and it turned out to be a total joke. Disaster doesn't even describe it."