Rebel Wilson says that she had a clause in her Pitch Perfect contract that said she couldn't lose weight.
The Australian actor made her name in a series of hit comedies over the past decade or so.
But she's revealed that she was put under pressure to maintain a curvier figure for her role as 'Fat Amy' in the musical trilogy.
Following a meeting with a doctor at a fertility clinic, the 42-year-old decided to lose some weight and get a bit healthier.
"I did wait until Pitch Perfect seemed like it was over," she said.
"I couldn’t lose a massive amount of weight because it was in the contracts for that movie. You can’t lose - I think it’s not more than 10 pounds or gain more than 10 pounds. You have to kind of stay at the weight. It’s in your contract."
Wilson went on: "But I had been thinking for a while like, ‘Oh, I want to get healthier'. And I was stereotyped in playing that fat, funny friend, which is so hard because I love those roles. I love doing the roles; I love those characters.
"But then I did want to do more things, but I felt like being the bigger girl, you’re just more pigeonholed.
"I was very much stereotyped into playing the fat, funny girl, which I loved and which I played into and made millions of dollars doing.
"To me, that was not a negative whatsoever, but sometimes when you transform yourself physically, it can make people look at you in a slightly different way.
"There can be benefits to that and people look at you and say, ‘Oh, she’s different now, maybe we should cast her in different projects'."
LADbible has contacted Universal Pictures for a comment.
Wilson has previously opened up about her fertility journey, which saw her lose an incredible 77lbs.
She said that it took a long time to get to that point, and that she'd tried on several occasions to get healthy.
"I've tried, like so many women out there, I've tried fads and diets and things before and I'm like, I need to do a really holistic approach to this, this time.
"My diet was mainly all carbs."Featured Image Credit: Doug Peters / Alamy