Danielle gave birth to their daughter yesterday (2 February) hours after Kevin had told his fans on Twitter: "We're pushing!"
The couple have now shared the first picture of Alena Rose with their followers and it was taken shortly after her arrival.
The gorgeous photograph shows Danielle cradling their baby in a soft white blanket while the tot gazes up at her mother.
Alongside the intimate snapshot, the caption reads: "On this day, a little star was born. Meet Alena Rose Jonas. #BabyJonas."
Kevin, who found fame with his siblings in the Jonas Brothers, informed fans of Danielle's labour yesterday afternoon alongside a picture of a monitor in the hospital.
He said: "#babyjonas is on the way!! It's showtime #thisisnotadrill." Kevin added: "I'm so excited #BabyJonasIsComing."
Hours later, Kevin updated his followers by tweeting: "Here we go we're pushing!!!! #babyjonas."
Earlier today, after Alena Rose's arrival, he simply said: "I'm so in love with her." Aww, congratulations!
US singer Kevin announced his wife Danielle's pregnancy news in July.
He tweeted: "It's true @daniellejonas is pregnant! Can't even imagine how excited we are. I can't wait to share this with my best friend. I love you baby."
Celebrities who have welcomed babies in 2014:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe