The 32-year-old fashionista is expecting her second child with fiance Eric Johnson, reported Us magazine.
After giving up on heels, Simpson recently posted a picture of herself in flats.
She tweeted along with the picture, "Practicing walking in flats around my house."
"It's a totally different pregnancy. I just feel awful, I've been vomiting. The crazy thing is I never knew a wiener could make me nauseous," she added.
Simpson has a 11-month old daughter Maxwell with Johnson.
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