Jennette McCurdy says her dislike for Ariana Grande began soon after they started filming their Nickelodeon show when she realized the pop star allegedly got permission to pursue outside opportunities.

“I booked two features during ‘iCarly’ that I had to turn down because the ‘iCarly’ team wouldn’t write me out of episodes to go shoot them,” McCurdy writes in her new memoir, “I’m Glad My Mom Died,” claiming producers would stuff Grande’s character in a box so that she could miss filming.

Kidding me,” McCurdy recalls thinking.

The “Best Player” actress, 30, admitted that once Grande, 29, was allowed to ditch filming, she snapped.

For a few reasons,” she writes.

A rep for Nickelodeon never returned Page Six’s request for comment

McCurdy writes that after departing the kids’ entertainment network, she turned down a $300,000 offer that would require her never to speak publicly about her experiences there