His wife Kristin Kay Willits gave birth to their baby boy Maxwell Haze Richardson on Wednesday, reported Ace Showbiz.
The proud father announced the arrival of his bundle of joy on Facebook.
"Special delivery! Another Richardson boy... At 3:05am Wednesday morning, Maxwell Haze Richardson decided to join the party. He is stout. Love! Love! Love!" he wrote.
Baby Maxwell will join his big brother Mason, who was born six years ago.
Back in April, Richardson announced that he and his wife were expecting a baby via Facebook.
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Richardson, who left Backstreet Boys in 2006, rejoined Brian Littrell, Nick Carter, Howie Dorough and AJ McLean last year. The band later announced that they would release an album called "In a World Like This".
The group's latest album will be released on July 30. On August 2, they will kick off "In a World Like This" world tour in Chicago.