Dewan-Tatum's guest stint on the FX series was thought to be over, as her character was apparently murdered.
The actress, who is pregnant and expecting her first child with husband Channing Tatum, will appear in one more episode of Ryan Murphy's horror drama.
"Even though it seems as if I'm dead and skinned alive, I'm shockingly in another episode," Dewan-Tatum told TV Guide. "Anything is possible on that show."
Dewan-Tatum appeared in the show as Teresa Morrison, the wife of Adam Levine's character Leo.
The exact manner in which Teresa will return to the show has not yet been made clear.
American Horror Story resumes tomorrow (January 2, 2013) on FX in the US with a new episode titled 'The Name Game'. The show will return to FX UK on January 8, 2013.
Watch a promo clip from American Horror Story: Asylum below: