Chris Lambton and his wife Peyton Lambton are expecting another baby!

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Peyton, who competed on The Bachelor's tenth season, announced Tuesday on Instagram and her blog that she is pregnant. This will be the second child for Peyton and The Bachelorette's Season 6 runner-up.

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"Our team is expanding and we couldn't be more excited!!" Peyton, 35, captioned a family photo of the couple and their 19-month-old daughter Lyla James.

"Baby Lambton will be here in December and Lyla James is ready for her promotion to big sister!"

Peyton added in her blog, "We can't wait to see Lyla James as a big sister. She is so nurturing and loves taking care of her baby dolls so I think and hope that will transfer into a real baby. Fingers crossed!"

Although Chris -- whose new Lawn & Order series premiered in May on DIY Network -- and Peyton underwent in vitro fertilization to conceive Lyla, the couple had a little miracle with Peyton's second pregnancy, as they conceived naturally.

"I just assumed [in vitro] was how we would create all of our babies," Peyton wrote.

"It's funny how things work out. In April we went to visit our IVF clinic to find out the process for transferring one of our frozen embryos. We were lucky to have 3 frozen from my first retrieval in 2016... I thought maybe we would schedule to implant... after the summer was winding down," she continued.

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"As I was waiting to start my cycle in April I found out I was pregnant! Yes, naturally! Talk about a complete shock. We tried for years to get pregnant the old fashioned way and it didn't work. How in the world is it happening now?"

Chris and Peyton were introduced by mutual friends after their respective seasons of The Bachelorette and The Bachelor, and they married in 2012. The pair welcomed Lyla in November 2016.

Chris and Peyton have yet to find out the sex of their baby on the way, but for right now, they want to "wait to be surprised."

"I feel a bit of empowerment that my body was able to do its job. I'm happy that IVF exists and I am also happy to have a different experience this time around," Peyton shared in her blog.

"It has taken me some time to wrap my brain around this because I am such a planner and IVF did work for my OCD brain. But the unknown is exhilarating and I am embracing this different experience and can't wait to meet this baby in December.

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Peyton is thrilled to be expecting Baby No. 2, but she admitted the first trimester was tough for her physically.

"I have been sick as a dog, but I am finally coming around," she revealed.

"The exhaustion is no joke, especially with a very active toddler running around. We can't wait to see Lyla James as a big sister. She is so nurturing and loves taking care of her baby dolls so I think and hope that will transfer into a real baby."

In addition to their Bachelor-franchise shows, Chris and Peyton have starred on the HGTV series Going Yard as well as the DIY Network series Yard Crashers.

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About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.