Selena Gomez's Mother Expecting a Baby (PHOTO)

It looks like Disney star Selena Gomez is expecting another sibling on the way, as she confirmed on Mother's Day on Twitter some exciting news: her mother, Mandy Teefey, is pregnant.

"Hope all the amazing moms had a great day!," she tweeted. "I have the best momma in the world :)) I love you so much!"

Gomez included a twitpic of her and her mom all smiles, Gomez shown touching her mom's very obvious baby bump. The 20-year old star will become a big sister for the first time. The new pic of a very pregnant Mandy was met with tons of congratulations from fans on Twitter, who wish the family the very best during Teefey's pregnancy.

Teefey and her husband Brian married when Gomez was five-years-old, and tragically lost a baby to a miscarriage just two years ago on Dec. 16, 2011. The event caused Gomez to cancel her December 17, 2011 concert in Chicago and a December 18, 2011 concert in Seattle to be at home with her grieving mother, according to HollywoodLife.com.

Although the event rocked the family, it looks like Teefey and family have healed, excited to welcome the new bundle of joy to the world.

 The 20-year-old singer and actress recently premiered her music video for her new single "Come & Get It," the first single off of her upcoming studio album "Stars Dance."

Having recently starred in the racy film "Spring Breakers" - which Gomez stressed to her younger fans was not for kids - her post-Disney career has been one of the most successful among Disney starlets.

Her private life has become the source of much media scurnity after her very public break-up and recent reunion with superstar boyfriend, Justin Bieber. But the star recently confirmed in an interview with Boston Kiss 108 on Friday that she's no longer with Bieber, and "available in every way."