Catherine and Sean Lowe welcome their 3rd child, daughter Mia

It's a girl!

Former "Bachelor" stars Sean and Catherine Lowe welcomed their third child, a daughter, on Monday, the couple announced on social media.

Baby Mia joins big brothers Samuel, 3, and Isaiah, 1.

"Mama, Mia," Catherine Lowe captioned a selfie of herself holding the newborn.

Added Sean Lowe in a post of his own: "I’ve always wanted a daddy’s girl and now I’ve got her. Mia is healthy, Mama is doing great, and God is so good!"

Sean, 36, and Catherine, 33, met during season 17 of "The Bachelor," which aired in 2013. They said "I do" in a televised wedding the next year.

Last month, Catherine, who did not know Mia's sex ahead of time, threw herself a pink-themed baby shower at home -- because if she had another boy, “I will have to wait a very long time to have another girly party," she said on Instagram.

“I’m doing obnoxious pink, fun, girly, feminine, whatever, because I’ve never gotten to do anything girly and I thought why not do it for the ambiguous gender that is my third child?” she continued, according to People. “So again, do not be confused. It is not a gender reveal. It is not an actual ‘girl’ baby shower. It’s just a girly baby shower.”