Kevin's brother, Nick Jonas, was the first to confirm the news via Twitter, writing, "AHH! I'm an uncle again! Congrats to my brother and sister in law on the birth of their new beautiful baby girl. @kevinjonas @daniellejonas."
AHH! I'm an uncle again! Congrats to my brother and sister in law on the birth of their new beautiful baby girl. @kevinjonas@daniellejonas
The "Chains" singer, who is currently in Hawaii, also took to Instagram to congratulate his brother with a sweet video message. "I just got the best news ever," he said in the clip. "My brother and his wife had their baby. I'm overjoyed!"
Prior to the newborn's arrival, Kevin and Danielle, who are also parents to 2-year-old daughter Alena Rose, were giving updates from the hospital on social media. Kevin told his fans that for him, "waiting is the hardest part," while "Dani would probably say the contractions."
"Can't believe we're gonna have 2 baby's," he added.
Danielle and Kevin announced they were expecting in April with a sweet pic of the two snacking on junk food and reading the parenting self-help book, What to Expect When You're Expecting Again. "Prepping for baby number two! #babyjonas2," Kevin exclaimed at the time.