Zac Hanson joked he was 'freaking out' after telling fans he's welcomed his fifth child with his wife Kate.
The proud parents introduced son Quincy Joseph Thoreau Hanson to fans on Instagram alongside a snap of him cradled in his dad's arms.
The youngest member of 90s' boyband Hanson, 35, revealed their son was born on Sunday - and he and Kate seemed ecstatic after sharing the news.
"I am a little late, but I celebrated #internationalwomensday the best way I know how," he wrote on his social media.
"Marveling at the superpower women are uniquely gifted... as well as freaking out over the fact that I am now responsible to help raise another person."
Zac concluded: "Quincy Joseph Thoreau Hanson. Born 3/7/21."
The couple share two daughters - Junia, 10, and Mary, four, as well as two sons - John Ira Shepherd, 12, and seven-year-old George - together already, and their children were no doubt thrilled to have another sibling.
They have been married since June 2006 after dating for six years.
In January, Zac announced Kate was pregnant.
He told PEOPLE: "We're so happy and thankful for the things 2020 got right, especially this little guy coming in March!
"Here's to fresh starts and new beginnings."
And his wife added to US Weekly: "We feel really fulfilled and complete with five!
"The biggest difference this time around has been how much more aware and excited our kids are about the new baby now that they're older."
Having a big family runs in the Hanson clan, as his older brother Taylor, 37, has seven children, and their other brother Isaac, 40, has three.
Congratulations, Zac and Kate!
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