Jennette McCurdy reveals what made her forever ‘pissed’ at Ariana Grande

Jennette McCurdy says she disliked Ariana Grande after learning she had clearance to pursue outside prospects.

"I booked two films during 'iCarly' that I had to turn down because the 'iCarly' staff wouldn't write me out of episodes to go shoot them," McCurdy says in her new memoir

If you are. I hope you're kidding me," McCurdy said. I must decline movies while Ariana is busy whistling at the Billboard Music Awards, then. F–k. This.”

The "Best Player" actress, 30, acknowledged that Grande, 29, lost her cool after she was given permission to stop filming.

I'm furious about it. She has me in a rage. envy for her. because of a few factors," she writes. "As a result, she now perceives every absence from work as a personal attack. … I didn't like her then and there. I was unable to like her.

The first season of "iCarly" concluded in 2012, and "Sam & Cat" only lasted one season from 2013 to 2014.

Page Six's request for response from a Nickelodeon representative was never answered.

The passages from McCurdy's memoir have not received an official response from Grande.

The remainder of the "Zoey 101" alum's book is made up of painful anecdotes about her struggle with bulimia and her tense relationship with Nickelodeon and her mother.