The Jonas Family Gushes Over Kevin's Baby Girl Alena Rose Jonas Following The Death Of Their Grandfather

Kevin Jonas and his wife Danielle welcomed a baby girl, Alena Rose Jonas, into the world on Feb. 2, and already, the entire Jonas family is gushing about their love for the new addition.

"I'm so in love with her," Kevin tweeted last night.

Younger brother Nick wrote, "My grandfathers memorial was yesterday. Today we welcome a new addition to the jonas family. God is great. Can't wait to meet my new niece."

Jerry Jonas, the Jonas brothers' grandfather, passed away on Jan. 28 after a years-long battle with cancer. Immediately following the death, all three brothers took to social media where they praised the elder Jonas, calling him a "mentor" and "one of the greatest men."

Joe Jonas added, "As one life ends, another begins. Incredibly happy to be an uncle for the first time. Welcome to this world my beautiful niece."

Also adding to the Twitter love was Danielle's mother, Angela Deleasa, who shared a photo of some family members hanging out in the hospital waiting room, "waiting for a special blessing."

On Sunday, following the birth announcement, Kevin and wife Danielle told E! News, "We are overjoyed at the birth of Alena Rose Jonas. She is precious! We could not be more excited to start building our family together. We want to thank our family and friends for their love and support, and our fans for all of their well wishes."

Of finding out about Danielle's pregnancy, Kevin explained, "I was overjoyed. It's been the most exciting thing in my life so far. I'm excited and I'm nervous."