On Tuesday night, Chambers shared her newborn baby's first family photo with his mom, dad and 2-year-old sister Harper. "Beyond grateful for the prayers and for this ultimate blessing," she captioned the image. "We couldn't be more in love."
Harper proudly displayed her new title of big sister on her dress upon meeting the new addition to the family. "Homeward bound and just a little excited. #insistedonwearingthisdressfortwodays," Chambers, 34, said of her daughter.
The adorable toddler also showed her uncle what she's been learning about being the older sibling. "Practice makes perfect," her proud mother wrote. "Showing her Uncle John how this big sister thing is done. #wildhairdontcare."
Hammer had a bit of a health scare just a few days prior to the birth of his son. The Nocturnal Animals star was rushed to the hospital with a torn pectoral muscle and had to undergo surgery. "Dear baby, Please don't come in the next 5 hours. Thank you, Mom and Dad," Chambers said ahead of her husband's surgery.
In November, Hammer admitted to ET that he was a little nervous about being a father of two. "You have a little more faith in the human mechanism," the 30-year-old actor said. "The only reason you're here and I'm here is because it works. We got through with one good baby, I think we can do it again."