Teen star has been busy tweeting the big family news – she is going to be a big sister soon.  Selena announced that her mother, Mandy Teefey and step dad Brian Teefy are expecting a baby.

Her mother has been married to Brian for 5 years and this will be their first child together. Her parents Mandy and Ricardo Gomez, who is from Mexico, split when she was five years-old and she was raised as an only child.

Selena tweeted a picture of her mom and step dad when announcing: 

Momma and Brian are finally letting me share the news…My mommys carrying my baby brother or sister ☺ I’m the happiest girl in the world!

Mandy was 16 years-old when she gave birth to the now 19-year old star.