"Born at home in a flash, just the most amazing experience for mama and baby girl," the couple wrote on Instagram cayley jenner/instagram (2) and are parents again! The couple welcomed daughter Joan Almond Jenner, sharing the exciting news in a joint post on Tuesday, Aug. 27. The couple is already parents to twin boys , 4, and daughter , 8, whom Brandon shares with ex .

Born at home, baby Joan weighed 9 lbs., 2 oz., and measured 21.

5 inches long. "She’s here. Joan Almond Jenner.

Named after Cayley’s beloved grandma (Joanie). Born at home in a flash, just the most amazing experience for mama and baby girl. A beautiful, gentle birth," the pair wrote alongside a photo of the newborn.

"Perfect little peanut, we couldn’t be more in love. And the kids are absolutely thrilled to have a baby sister. Welcome to our world, sweet baby love.

" Related: Cayley and Brandon, the son of and Linda Thompson, were sent plenty of well wishes in the comments of their post. dropped a heart-eye emoji while Brody Jenner's fiancée added, "Welcome to the world perfect girl! ❤️ You are so, so loved!" In February, the couple that they were welcoming another baby together. “When I went to tell Brandon that night as we were getting ready for bed he totally beat me to the punch,” Cayley recalled to PEOPLE of sharing the exciting news with her husband.

“I had the tests in my pocket and I was going to just lay them down as he was brushing his teeth, but before I could do it, he looked at me .