Kevin Jonas welcomes daughter Alena Rose

It's new-dad euphoria for Kevin Jonas.

"I'm so in love with her," he tweeted after the birth of his daughter, Alena Rose.

The singer and his wife, Danielle, shared a photo of the newborn on Twitter.

Give papa props for keeping his fans updated. "Here we go we're pushing!!!! #babyjonas," he tweeted Sunday.

First came love, next came marriage, and finally, a TV deal. Kevin and Danielle met in 2007 and got married in 2009, and went on to star in their own reality show, Married To Jonas.

Uncle Joe also tweeted his congrats: "As one life ends, another begins. Incredibly happy to be an uncle for the first time. Welcome to this world my beautiful niece."