'Big Brother' Stars Rachel Reilly & Brendon Villegas Welcome First Baby - It's a Girl!

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It's a Big Brother baby!

Rachel Reilly and her former co-star husband, Brendon Villegas, welcomed their first child, a baby girl, the couple confirms to ET.

EXCLUSIVE: 'Big Brother' Stars Jeff Schroeder and Jordan Lloyd Share Their Baby's First Sonogram -- See the Pic!

Their new bundle of joy was born at 8 a.m. on Friday after 24 hours of labor. It was a natural birth and the two have yet to decide on a name.

Rachel first broke the happy news on Twitter, writing, "@brendonvbb12 & I are officially parents! Omg ???thank you for all the prayers and well wishes it was long hard and we did it all natural."

MORE: Surprise! Jordan Lloyd and Jeff Schroeder Are Married and Expecting

The couple, who met on season 12 of the CBS reality show, has been married since 2012.

Last weekend, Reilly shared a last minute baby bump photo to Instagram, writing, "#daydate waiting for #baby #babybump #pregnancy."

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Meanwhile, this isn't the only Big Brotherbaby news going on!

Watch the video below to see Jordan Lloyd and Jeff Schroeder's first sonogram.