Selena Gomez reveals that her mother is expecting

There is more baby news in Justin Bieber's world, and this time, it's good news. His girlfriend Selena Gomez just revealed that her mother and step-father are expecting.

The holiday celebrations are that much happier in Selena Gomez's house this year. The young star just announced on Twitter that her mom, Mandy Teefey is pregnant.

"Momma and Brian are finally letting me share the news," she Tweeted. "My mommys carrying my baby brother or sister :)." She posted a photo of her mom and step-father Brian Teefey and Tweeted, "I'm the happiest girl in the world."

"Congrats Selena" became a trending topic on Twitter right away. Congratulations to Selena and her expanding family.