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Hollywood actresses often have to lose weight for movies, so when the role of a lifetime comes up and you need to gain a few pounds—it's a no brainer!

Isla Fisher revealed to E!'s own Jason Kennedy andAlicia Quarles at the New York premiere of The Great Gatsby that she had to put on a little weight to honor her character, Myrtle.

"They didn't tell me to put on weight," she revealed. "I just knew the character was described as buxom, so I wanted to do the book justice."

So how did the actress manage to gain 10 pounds for the role?

"It's pretty easy," she joked.

Sacha Baron Cohen's wife admitted to treating herself to baked goods while prepping for Gatsby.

"I was breastfeeding, so I had a little flesh of my own, I am proud to admit," she told Easy Living Magazine. "But I also gained 10 pounds, just by following my natural instincts. Cupcakes!"

For more from The Great Gatsby's NYC premiere, tune in to E! News at 7 p.m.