Selena Gomez: I'm Going to Be a Big Sister!

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It took 19 years, but Selena Gomez is finally getting a sibling!

"Momma and Brian are finally letting me share the news," Gomez posted on her Instagram account Friday. "My mommy's carrying my baby brother or sister. I'm the happiest girl in the world!"

Gomez's birth parents divorced when she was five years old; she was raised primarily by her mother, Mandy Dawn Cornett. In 2006, Cornett married Brian Teefey, and this will be their first child together.

The Disney Channel star's baby news is notably more positive than the recent scandal surrounding her boyfriend Justin Bieber, who was accused of fathering a 4-month-old baby boy with Mariah Yeater.

In Yeater's paternity suit (which was dropped in mid-November), the single mom claimed she became pregnant following a 30-second sexual encounter with Bieber backstage at an L.A. concert in October 2010. Bieber, 17, has since provided a DNA sample to prove he is not the father.