Joey McIntyre and his wife, Barrett, welcomed baby girl Kira Katherine McIntyre into the world on May 31, and now the NKOTBSB member has posted the first photo of his little bundle of joy.

On Sunday, the singer tweeted, "Happy Father's Day : ) xoxo" along with the sweet pic of his newborn, whom he referred to as “a beautiful baby girl with great timing and gorgeous hair.”

Baby Kira is the first daughter for the couple, adding to the brood that already includes sons Griffin, 3, and Rhys, 1, who was born with severe hearing loss. McIntyre and his wife have been open about Rhys' condition, emphasizing the importance of early diagnosis.

McIntyre has been busy on the road with his New Kids on the Block and Backstreet Boys collaboration, which includes AJ McLean, Jordan Knight, Howie Dorough, Jonathan Knight, Donnie Wahlberg, Brian Littrell, Danny Wood and Nick Carter.

NKOTBSB recently appeared on the ‘TODAY’ show’s Toyota Concert Series on June 3, and have been trekking throughout North America on their headlining tour.

NKOTBSB made their television debut at the 2010 American Music Awards last November before announcing their summer run. The group performed a medley of hits on stage, including the Backstreet Boys' 'I Want It That Way' and NKOTB's 'Hangin' Tough.'

Watch the NKOTBSB 2010 AMA Performance