Selena Gomez celebrates mom's baby bump

Selena Gomez shared a sweet photo of her mother, Mandy Teefey, on Sunday.

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

It looks like the pop singer, 20, will soon have a sibling.

It will be the second child for Mandy, 37, who divorced Selena's father, Ricardo Gomez, when Selena was 5. Mandy wed Brian Teefey in 2006.