Morris, 26, is said to be expecting with her long-time boyfriend Taylor Hubbell and is three months along.
Back in 2011, Morris made it clear she had plans for the future with Hubbell, whom she met in high school.
"I want to marry Taylor and have kids with him," she told Fitness. "I love acting, but if it affects my relationship, then I won't continue."
No word yet on how Morris' pregnancy might alter production. Emails to Morris' rep and Fox were not immediately returned.