Rose, 32, confirmed the big news on Instagram Monday by writing, "Ok y'all the cat or should I say baby is out of the bag, lol! It's true I'm preggers and couldn't be more excited. #TheBachelor #babyfever #LibraBaby."
"I am really excited!" Rose toldUs Weekly in a statement. "We were trying, but I didn't expect it to happen so soon. It's something that I've always wanted and feel ready for, so we can't wait."
Rose is reportedly due on September 24 and intends to wed Gentry once the baby arrives.
"We don't know the gender. The first week, I felt like it was a girl, and then I was for sure it was a boy, so now I can't decide if I even want to know yet!" Rose admitted.
"[Galen and I] aren't married yet, but we are considering ourselves engaged. We were thinking about getting married in the next few months, but I think it'll probably happen after the baby comes, since there's so much to do!"
The couple began dating in November after meeting at work. Rose is the director of business development for Gentry Law Group, while Gentry is an attorney there.
"I just hope this baby is a Libra, since I'm an Aries, and Aries get along really well with Libras," Rose, who currently lives in Los Angeles, told Us.
Rose initially vied for the affection of Lorenzo Borghese on The Bachelor's ninth season. She then competed on the second and third editions of Bachelor Pad and later appeared on VH1's You're Cut Off! reality series.