Gracie Elliot Teefey Encino Selena Gomez new sister celebrate

Congratulations!

Selena Gomez donned her best flower child ensemble on Friday as she and a friend went to the Encino Pavilions amid the big news: her mom just gave birth to a new baby girl!

The 20-yer-old actress' mom Mandy Teefey and her husband Brian welcomed their baby girl Gracie Elliot Teefey on Wednesday. Even her BFF Demi Lovato got in on the occasion with a festive tweet to help usher in the newborn.

"@selenagomez IS A BIG SISTER!!!!!! Everyone congratulate her and her family!!!!!! #CONGRATSSELENA!!!! #CONGRATSSELENAMANDYANDBRIAN !!!!!!" she tweeted Thursday night.

We have no doubt what a great sibling Selena will be!