Kevin Jonas is ''so in love'' with his baby daughter.

The 26-year-old singer and wife Danielle welcomed baby Alena Rose into the world yesterday (02.02.14) and the 'Married to Jonas' star - who tweeted throughout his spouse's labour - is smitten with the new arrival.

He tweeted: ''I'm so in love with her (sic)''

Alena's arrival was particularly meaningful for the Jonas family as Danielle gave birth on Kevin's grandfather's memorial.

Kevin's brothers and former bandmates Nick and Joe Jonas had their grandfather on their mind as they spoke of their excitement at the new arrival.

Nick tweeted: ''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.(sic)''

And Joe wrote: ''As one life ends, another begins. Incredibly happy to be an uncle for the first time. Welcome to this world my beautiful niece (sic)''

Before Alena was born, Danielle had promised fans her name was ''cute'' but ''different''.

She previously said: ''The middle name has a lot of meaning, but her first name is ... different enough but not totally out there. It's cute.''