The 25-year-old 'Mildred Pierce' star and her husband Jamie Bell are expecting their first child together, reported Us magazine.
"Whoa. Whoa. Peanut Butter Pop Tarts?! Of course, because I can't smoke any weed right now. Dammit!," she posted on Twitter.
Wood, 25, said sometimes her diet goes to hell as she awaits the arrival of her child.
"You gotta have your naughty days," she wrote.
Earlier this year, a representative of the actress had confirmed the actress' pregnancy.