Kevin's brothers Nick and Joe Jonas also shared notes about their new niece. Nick wrote, referencing their grandfather's recent death, "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."
Joe added, "As one life ends, another begins. Incredibly happy to be an uncle for the first time. Welcome to this world my beautiful niece."
In addition to the Jonas Brothers' Twitter love, Danielle's mom Angela Deleasa shared a cute photo of family members hanging out in the hospital waiting room, writing, "waiting for a special blessing."
Yesterday, Kevin and Danielle gushed to E! News after her birth, "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."
This is the first child for the Married to Jonas stars, who married back in December 2009.
—Reporting by Lindsey Caldwell