The Rock's girlfriend is having a baby girl

The 'San Andreas' star and Lauren announced they are expecting their first child together in September and the wrestler-turned-actor has now taken to his Instagram account to reveal they're preparing for the birth of a girl.

Dwayne posted a picture of himself cradling Lauren's baby bump, and captioned the image: "I was raised by and live with amazing and strong women, so the universe felt we needed one more... IT'S A BABY GIRL!! THANK YOU guys so much for the awesome support and love you've sent @laurenhashianofficial and myself from around the world. We're so grateful for this blessing and thrilled to share the news with y'all. (sic)"

I was raised by and live with amazing and strong women, so the universe felt we needed one more... IT'S A BABY GIRL!! THANK YOU guys so much for the awesome support and love you've sent @laurenhashianofficial and myself from around the world. We're so grateful for this blessing and thrilled to share the news with y'all. #BringOnMoreEstrogenInOurHome #MeAndPuppyHobbsAreTheOnlyDudes #2xProudPapaBear #JustOverHereMakingBabiesAndStuff #AndPalmingPregnantBellys 🙏🏾👶🏾

A photo posted by therock (@therock) on Nov 10, 2015 at 9:12am PST

Dwayne already has a 14-year-old daughter, Simone Alexandra, with his ex-wife Dany Garcia, and a source close to the Hollywood star recently said he's "thrilled" at the prospect of becoming a father for the second time.

The source explained: "Dwayne and Lauren couldn't be more thrilled. They've been rock solid for about nine years now and felt it was time to expand their family.

"Lauren's brother is also expecting a baby, so the entire family is overjoyed!"