"Momma, Brian, and me are all so grateful for all your well wishes," Gomez tweeted on June 14. "My lil sissy Gracie Elliot Teefey was born on June 12th. Luv you all XO."
The timing of the announcement, made two days before Father's Day, was apropos since the pregnancy was announced by Gomez on Mother's Day of this year.
"Hope all the amazing moms had a great day! I have the best momma in the world :)) I love you so much!" Gomez tweeted at the time, along with a photo of her hand on her mom's belly, according to the Huffington Post.
Gracie Teefey is the daughter of Gomez's mom, Mandy Cornett Teefey, and her husband, Brian Teefey. The couple has been married since 2006, and this is their first child together.
Gomez has shown her love for Justin Bieber's younger siblings throughout the past few years, and she has a lot of experience being a big sister. Her friend — and former fellow Disney star — Demi Lovato tweeted her excitement over the new baby.
"@selenagomez IS A BIG SISTER!!!!!! Everyone congratulate her and her family!!!!!! #CONGRATSSELENA!!!!"
Sometimes-boyfriend Justin Bieber stayed quiet on Twitter about the birth. He spent the weekend tweeting about new music, as well a random string of photos showing frogs mowing lawns (yes, really).
Gomez has had a lot to look forward to this year. She been expecting not only a new baby in her family but also a new album. Stars Dance is expected out July 23.
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