Selena Gomez has a baby sister!

According to reports, Sel's mother Mandy Teefey gave birth to a baby girl on Wednesday, June 12. The bundle of joy is the first child for Mandy and her husband Brian Teefey, who is Sel's stepfather. Pertinent details about Baby Girl Teefy, such as her name, weight and other measurements, have yet to be revealed. We can't wait for her big sis to share a pic on social media.

Gomez shared the news of her mother's pregnancy on Mother's Day, via a photo she tweeted of the two, with her mom's round, full-with-baby belly prominently featured.

Teefey was expecting in 2011 but suffered a miscarriage. She lost the baby just before Christmas. Based on a statement that the family released at the time, the baby was believed to be a girl that they planned to name Scarlett.

Thankfully, the family was able to mourn the loss and open their hearts to having another child.

Gomez's pal Demi Lovato also expressed her joy over the baby's arrival.

Sel, who turns 21 in July, has not tweeted about the addition to her family yet. All in due time. She is no doubt over-the-moon about this pink arrival.

Congrats to Selena Gomez and her family. We bet she'll be such a good sister.