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Justin Bieber, Selena Gomez

Flynet Pictures

Justin Bieber's girlfriend Selena Gomez took to Twitter to reveal she's expecting a baby.

Well, a baby brother or sister, that is.

The singer tweeted: "Momma and Brian are finally letting me share the news...My mommy's carrying my baby brother or sister :) I'm the happiest girl in the world!"

The singer's parents divorced back when Selena was only 5 years old. Her "momma," Mandy, married current hubby Brian Teefey in 2006.

As for Selena's own relationship with the Biebs—the former Disney star has remained by his side during his alleged baby drama. Although the paternity suit has been dropped and Justin's taken a DNA test, the alleged baby mama is currently demanding another test!

So how about Selena and Justin's baby plans of their own? It seems they're fine for now with parenting their own baby, Baylor.