The former "Wizards of Waverly Place" actress announced that her mother Mandy is pregnant while wishing Mother's Day on Twitter.
She posted a picture of her smiling and putting her hand on her mother's pregnant belly, reported Aceshowbiz.
"Hope all the amazing moms had a great day! I have the best momma in the world :)) I love you so much!" she captioned the photo.
The bundle of joy will be her mother's first child with Brian, whom Mandy married when Gomez was five. The happy news came two years after the family survived heartbreak when Mandy suffered a miscarriage in 2011.