Congratulations to Selena Gomez! She's going to be a big sister.

Gomez announced the news on Twitter yesterday, posting the above photo with the caption, "Hope all the amazing moms had a great day! I have the best momma in the world. I love you so much!" So cute!

It's a welcome bit of good news for Gomez and her family. The 'Come & Get It' singer's mom suffered a miscarriage in December 2011, leading Gomez to cancel a concert while she grieved the loss of what would have been her younger sister or brother.

No more details of the pregnancy have been announced yet, but considering how great Gomez was (or is, depending on the day) with on-again off-again boyfriend Justin Bieber's little siblings, you can bet she's going to be an amazing big sis. Congrats, Sel!

Watch Selena Gomez 'Come & Get It' Video