"We are absolutely thrilled! She's just so perfect, the cutest little nugget you've ever seen and I swear I'm not biased," J.P. said in a statement to ET. "She's a happy and healthy baby girl and we couldn't be more grateful! Our family of four now feels complete."
J.P. also took to Twitter to share his excitement over the birth of Essie -- whose full name is Essex Reese Rosenbaum -- born at 10:38 a.m. on Friday in Miami, Florida, according to People.The newborn weighed in at 7 lbs., 11 oz. and measured 19 inches long.
"Already has me wrapped around her little finger. I'm in trouble! #EssieLove," the proud father of two tweeted on Friday afternoon.
It seems the couple couldn't be more prepared for their little girl, documenting every step of Ashley's pregnancy on social media.
The pediatric dentist took to Instagram to share an adorable bumpin' pic just before her due date.
And it looks like their 2-year-old son, Ford, has already perfected his big brother duties.
"Practicing for 'baybeeeeeeeeeeee'!!" Ashley adorably captioned a snap of her son feeding a doll.
Ashley and J.P. got engaged on the season finale of The Bachelorette in 2011, and married in a televised wedding special a year later. The proud parents announced they were expecting their second child together in May.
"I'm 100% excited that we're #ClearblueConfirmed with baby#2!!!" J.P. captioned their sweet announcement on Instagram. "Forgive me if my face says I'm 78% nervous because #ItsAGirl ? #NoBoyfriendZone #BacheloretteSeason47 #YeahRight #ClearbluePartner."