The reality star welcomed her third child, a baby girl, on Wednesday.
Chelsea revealed the news with an adorable pic of her newborn looking cozy and cute in a white onesie and striped headband.
"Happy birthday to YOU, sweet baby Layne," the reality star captioned it.
The news is extra sweet for Chelsea, because she now shares a birthday with her daughter! She turned 27 on Wednesday, receiving lots of love from her husband.
"Happy birthday to my sweet perfect wife Chelsea DeBoer @chelseahouska who just gave our family this beautiful blessing!" Cole wrote on Instagram. "Sharing the same amazing day I am so in love with our family! Our newest edition Baby Layne!!"
This marks baby No. 2 for Chelsea and Cole, who also share a 1-year-old son, Watson. Chelsea also has an 8-year-old daughter, Aubree, from her previous relationship with Adam Lind.
Congrats to the happy couple!