"The Bachelorette" alum Chris Lambton is giving fans a first glimpse of his newborn son.

The 40-year-old took to Instagram Tuesday after welcoming a baby boy, Hayes Jennings, with his wife and "The Bachelor" alum Peyton Wright Lambton on Sunday.

Lambton shared a slideshow of photos of his family with their new addition. He and Peyton are also parents to 2-year-old daughter Lyla James.

"And now there's four!!!! So happy to have another member of our family. Little #HayesJennings was born Sunday and both he and @peytonwlambton are doing great #merrychristmasbaby #familyof4 #sohappy," the star wrote.

Peyton posted a series of pictures on her own account.

"IT'S A BOY!!! Hayes Jennings Lambton arrived Sunday morning and we are so in love! #babyboy #familyof4 #newborn #pregnancy #birth #family #hayesjennings #lylajames #bigsister #littlebrother #somuchlove #christmasbaby #happytobehome," she captioned the post.

Lambton and Peyton announced in July they were expecting a second child.

The couple conceived naturally after experiencing a miscarriage and using in vitro fertilization to have Lyla.

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"As I was waiting to start my cycle in April I found out I was pregnant! Yes, naturally!" Peyton said in a blog post.

"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!" she added.

Lambton and Peyton married in May 2012.

Lambton previously competed in "The Bachelorette" Season 6, while Peyton appeared in "The Bachelor" Season 10 and the first season of "Bachelor Pad."