The former Bachelor star seemed to be enjoying her meaningful new bling, sharing a series of snaps and one video of her glistening diamond ring in the sunlight.
"Stunning ring!" one fan commented on the classic style, with a simple gold band and oval cut diamond.
WATCH: Alex Nation shows off stunning engagement ring
The announcement will be sure to bring even more joy to their family, as Alex and Carson enjoy life as parents to a newborn.
When one of her Instagram followers recently asked how she was, Alex replied: “I am content, tired, and so incredibly happy. Thank you for asking.”
Alex also revealed that Elijah, her eldest son from a previous relationship, loves having a sibling.
"He is a such fantastic big brother and helper. I feel so lucky," she remarked.
Congratulations to the happy couple and their beautiful family of four!