'Walking Dead' star Alanna Masterson slams body shamers

Alanna Masterson isn't one to let body shaming slide.

The 28-year-old actress took to Instagram on Tuesday to fight back against those criticizing her weight on the latest episode of "The Walking Dead," telling trolls to "grow the f**k up."

WATCH: 'Walking Dead' Star Alanna Masterson Gives Birth to First Child

"Dear Instagram trolls, body shamers, and the men and woman who think it's ok to comment on my weight: I hope that you don't have children. And if you do, I hope you teach them about kindness and acceptance," she began the heated post.

"Maybe you can't get it through your thick f**king skull, but nursing a baby for a year (and pumping in a van between takes, in the dead of summer in Georgia) is a lot of work, determination, and scheduling," Masterson explained. "So before you decide to make a comment about my chest being 'too large' or how 'fat' I've become, just know that this little girl got the best start to life."

"Also, grow the f**k up," she continued. "I would LOVE to see any man or woman give birth to a baby, nurse the baby, and then work 17 hour days and NAIL their own stunts."

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Masterson welcomed her daughter with boyfriend Brick Stowell last November.

On last week's episode of "The Walking Dead," Masterson's character, Tara, stumbled into a fierce all-female community -- and barely made it back to Alexandria with her life.